@inbook {15912, title = {Deep-water fisheries resources in the Hellenic Seas}, booktitle = {State of Hellenic Fisheries}, year = {2007}, pages = {213-222}, isbn = {978-960-98054-1-4}, author = {Mytilineou, Ch and Machias, A.}, editor = {Papaconstantinou, C. and Zenetos, A. and Vassilopoulou, V. and Tserpes, G.} } @inbook {14824, title = {Fisheries independent assessment methods: acoustics}, booktitle = {State of Hellenic Fisheries}, year = {2007}, pages = {341-349}, isbn = {978-960-98054-1-4}, author = {Giannoulaki, M. and Machias, A.}, editor = {Papaconstantinou, C. and Zenetos, A. and Vassilopoulou, V. and Tserpes, G.} } @article {14825, title = {Effect of coastal topography on the spatial structure of the populations of small pelagic fish}, journal = {Marine Ecology Progress SeriesMarine Ecology Progress Series}, volume = {265}, year = {2003}, pages = {243{\textendash}253}, keywords = {Pisces}, author = {Giannoulaki, M. and Machias, A. and Koutsikopoulos, C. and Haralabous, J. and Somarakis, S. and Tsimenides, N.} } @article {14826, title = {The effect of coastal topography on the spatial structure of anchovy and sardine}, journal = {ICES Journal of Marine ScienceICES Journal of Marine Science}, volume = {63}, number = {4}, year = {2006}, note = {Times Cited: 0ArticleEnglishCited References Count: 35043rg}, month = {MAY}, pages = {650-662}, abstract = {Acoustic-survey data from 1995 to 2004 (six acoustic surveys in summer and two in winter) in the Aegean and Ionian Seas (eastern Mediterranean Sea) were analysed to investigate the spatial organization of European anchovy and European sardine populations. The potential effect of certain topographic characteristics (e.g. area, bottom depth, and the degree of land enclosure) on the spatial structure of the fish was studied in different geographic subareas (i.e. how topography affects the organization of fish into clusters of schools). Parameters calculated by geostatistical techniques were used as descriptors of the spatial organization. The results indicate the significant effect of area and land enclosure on the spatial structures of both species, suggesting that environmental spatial heterogeneity attributable to coastal topography affected the way fish schools were organized into aggregations. In summer, the spatial structure of sardine was more heterogeneous in subareas with increased land enclosure, whereas the spatial structure of anchovy was not significantly related to any of the area characteristics examined. In winter, the spatial structure of both species was more heterogeneous in subareas with increased enclosure and in small rather than larger subareas. The findings are discussed in terms of the species{\textquoteright} response to their environment. (c) 2006 International Council for the Exploration of the Sea. Published by Elsevier Ltd. All rights reserved.}, keywords = {abundance, anchovy, coastal topography, DAILY EGG-PRODUCTION, exhaustive variograms, geostatistics, land enclosure, northern aegean sea, Pisces, populations, sardine, small pelagic fish, stocks, waters}, author = {Giannoulaki, M. and Machias, A. and Koutsikopoulos, C. and Somarakis, S.} } @proceedings {14827, title = {Hydroacoustic investigation on the spatial distribution of anchovy (Engraulis encrasicolus) and sardine (Sardina pilchardus) in the North Aegean Sea in relation to environmental factors. }, year = {2002}, month = {22-25.5.2002}, pages = {39}, address = {Thessaloniki}, keywords = {kape pisces}, author = {Giannoulaki, M. and Machias, A. and Somarakis, S.} } @article {14828, title = {Wild fish spatial structure in response to presence of fish farms}, journal = {Journal of the Marine Biological Association of the United KingdomJournal of the Marine Biological Association of the United Kingdom}, volume = {85}, number = {05}, year = {2005}, pages = {1271-1277}, publisher = {CambridgeUnivPress}, keywords = {Pisces}, author = {Giannoulaki, M. and Machias, A. and Somarakis, S. and Karakassis, I.} } @article {14829, title = {The spatial distribution of anchovy and sardine in the northern Aegean Sea in relation to hydrographic regimes}, journal = {Belgian Journal of ZoologyBelgian Journal of Zoology}, volume = {135}, number = {2}, year = {2005}, note = {Times Cited: 1ArticleEnglishCited References Count: 20995eu}, month = {JUL}, pages = {151-156}, abstract = {Acoustic survey data were combined with hydrological parameters with the aim of understanding the relationships between the spatial distribution of anchovy and sardine and environmental regimes. Acoustic and concurrent hydrological sampling was carried out in the Northern Aegean Sea (eastern Mediterranean) during June 1995 and June 1996. In order to examine hydrological parameter selection by anchovy (Engraulis encrasicolus) and sardine (Sardina pilchardus), cumulative distribution functions were estimated. Both species were significantly associated with areas of deeper surface and upper mixed layers, which implied an association of anchovy and sardine with anticyclones. Within the range of available temperatures and bottom depths, sardine further showed a significant affinity to warm as well as to shallow waters. These results are discussed in relation to species{\textquoteright} life histories and existing knowledge of oceanographic features in the surveyed area.}, keywords = {anchovy, Atlantic, environmental variable selection, fish, northern aegean sea, Pisces, sardine, Spatial distribution}, author = {Giannoulaki, M. and Machias, A. and Somarakis, S. and Tsimenides, N.} } @article {14830, title = {Spatial modeling of the European sardine habitat in the eastern Mediterranean basin suing GIS tools}, journal = {Rapport du Congress de la CIESMRapport du Congress de la CIESM}, volume = {38}, year = {2007}, month = {2007}, pages = {486}, author = {Giannoulaki, M. and Machias, A. and Valavanis, V. and Somarakis, S. and Palialexis, A. and Tsagarakis, K. and Papaconstantinou, C.} } @proceedings {14831, title = {Spatial modelling of the european anchovy habitat in the eastern Mediterranean basin using GAMS and GIS technology}, year = {2006}, month = {26-30.6.2006}, pages = {38}, publisher = {Hellenic Zoological Society}, address = {Patra}, keywords = {kape pisces}, author = {Giannoulaki, M. and Machias, A. and Valavanis, V.D. and Somarakis, S. and Papaconstantinou, C.} } @article {14656, title = {Differential egg production of sardine off the central Hellenic coasts in December 1999. }, journal = {Rapport et Proc{\'e}s-Verbaux des R{\'e}unions de la Commission Internationale pour l{\textquoteright}Exploration Scientifique de la Mer M{\'e}diterran{\'e}eRapport et Proc{\'e}s-Verbaux des R{\'e}unions de la Commission Internationale pour l{\textquoteright}Exploration Scientifique de la Mer M{\'e}diterran}, volume = {36}, year = {2001}, pages = {268}, keywords = {Pisces}, author = {Ganias, K. and Somarakis, S. and Caragitsou, E. and Koutsikopoulos, C. and Machias, A. and Theodorou, A.} } @proceedings {14657, title = {Seasonal variation and organ weight indices of sardine in the Aegean and Ionian Seas. }, year = {2002}, month = {22-25.5.2002}, pages = {37}, address = {Thessaloniki}, keywords = {kape pisces}, author = {Ganias, K. and Somarakis, S. and Koutsikopoulos, C. and Machias, A. and Theodorou, A.} } @article {14658, title = {Ovarian atresia in the Mediterranean sardine, Sardina pilchardus sardina}, journal = {Journal of the Marine Biological Association of the United KingdomJournal of the Marine Biological Association of the United Kingdom}, volume = {83}, number = {06}, year = {2004}, pages = {1327-1332}, publisher = {CambridgeUnivPress}, keywords = {Pisces}, author = {Ganias, K. and Somarakis, S. and Koutsikopoulos, C. and Machias, A. and Theodorou, A.} } @article {14659, title = {Pattern of oocyte development and batch fecundity in the Mediterranean sardine}, journal = {Fisheries ResearchFisheries Research}, volume = {67}, number = {1}, year = {2004}, note = {Times Cited: 3ArticleEnglishCited References Count: 47775ju}, month = {MAR}, pages = {13-23}, abstract = {In the present study, the pattern of oocyte development was investigated in the Mediterranean sardine (Sardina pilchardus sardina) in order to examine whether non-hydrated females could be included in batch fecundity measurements. Gonad histology and frequency distributions of oocyte diameters demonstrated that the Mediterranean sardine exhibits group-synchronous type of oocyte development. The spawning batch begins to separate in size from the adjacent population of smaller oocytes at the secondary yolk globule stage and a well-developed size-hiatus is established at the tertiary yolk globule stage. The spawning batch could be clearly identified prior to hydration and batch fecundity-on-fish weight relationships did not differ significantly between hydrated females and females at the tertiary and migratory nucleus stages. Thus, apart from hydrated females, batch fecundity in the Mediterranean sardine may also be measured by the use of females at the tertiary and migratory nucleus stages. Relative fecundity was shown to be independent of body weight and its estimates during the respective peak spawning months for the Aegean Sea and Ionian Sea stocks were 360 eggs/g (December 2000) and 339 eggs/g (February 2001). (C) 2003 Elsevier B.V. All rights reserved.}, keywords = {anchovy, batch fecundity, egg-production method, estimating biomass, fishes, Florida, group-synchronous, mediterranean sardine, oocyte development, ovarian development, Pisces, reproductive-biology, sagax, sardina pilchardus sardina, size, spawning frequency}, author = {Ganias, K. and Somarakis, S. and Machias, A. and Theodorou, A.} } @article {14660, title = {Evaluation of spawning frequency in a Mediterranean sardine population (Sardina pilchardus sardina)}, journal = {Marine BiologyMarine Biology}, volume = {142}, number = {6}, year = {2003}, pages = {1169-1179}, publisher = {Springer}, keywords = {Pisces}, author = {Ganias, K. and Somarakis, S. and Machias, A. and Theodorou, A. J.} } @inbook {13518, title = {By-catch and discards in multi-species fisheries and their impact in the Hellenic waters}, booktitle = {State of Hellenic Fisheries}, year = {2007}, pages = {251-260}, isbn = {978-960-98054-1-4}, author = {Vassilopoulou, V. and Machias, A. and Tsagarakis, K.}, editor = {Papaconstantinou, C. and Zenetos, A. and Vassilopoulou, V. and Tserpes, G.} } @article {13168, title = {Distribution of fishes on the Cretan Shelf.}, journal = {Journal of Fish BiologyJournal of Fish Biology}, volume = {39}, number = {5}, year = {1991}, pages = {661-672.}, keywords = {Pisces}, author = {Tsimenidis, N. and Tserpes, G. and Machias, A. and Kallianiotis, A.} } @article {13159, title = {Distribution patterns of Triglids (Pisces: Triglidae) on the cretan shelf (Greece), and their interspecific associations.}, journal = {Fisheries Research (Amst.)Fisheries Research (Amst.)}, volume = {15}, number = {1-2}, year = {1992}, pages = {83-103}, author = {Tsimenides, N. and Machias, A. and Kallianiotis, A.} } @article {13079, title = {Food-web traits of the North Aegean Sea ecosystem (Eastern Mediterranean) and comparison with other Mediterranean ecosystems}, journal = {Estuarine, Coastal and Shelf ScienceEstuarine, Coastal and Shelf Science}, volume = {88}, number = {2}, year = {2010}, note = {Cited By (since 1996): 1Export Date: 8 November 2011Source: Scopus}, pages = {233-248}, author = {Tsagarakis, K. and Coll, M. and Giannoulaki, M. and Somarakis, S. and Papaconstantinou, C. and Machias, A.} } @article {13080, title = {Seasonal and temporal trends in metrics of fish community for otter-trawl discards in a Mediterranean ecosystem}, journal = {ICES Journal of Marine ScienceICES Journal of Marine Science}, volume = {65}, number = {4}, year = {2008}, month = {May}, pages = {539-550}, isbn = {1054-3139}, author = {Tsagarakis, K. and Machias, A. and Giannoulaki, M. and Somarakis, S. and Karakassis, I.} } @article {12429, title = {Can we define target species in Mediterranean trawl fisheries?}, journal = {Fisheries ResearchFisheries Research}, volume = {59}, year = {2003}, pages = {431-435}, keywords = {kape pisces}, author = {Stergiou, I. K. and Machias, A. and Somarakis, S. and Kapantagakis, A.} } @article {12088, title = {Age, growth and bathymetric distribution of red pandora (Pagellus erythrinus) on the Cretan shelf (eastern Mediterranean)}, journal = {Journal of the Marine Biological Association of the United KingdomJournal of the Marine Biological Association of the United Kingdom}, volume = {82}, number = {01}, year = {2002}, pages = {149-160}, publisher = {CambridgeUnivPress}, keywords = {Pisces}, author = {Somarakis, S. and Machias, A.} } @article {12084, title = {Spawning habitat and daily egg production of sardine (Sardina pilchardus) in the eastern Mediterranean}, journal = {Fisheries OceanographyFisheries Oceanography}, volume = {15}, number = {4}, year = {2006}, note = {Times Cited: 0ArticleEnglishCited References Count: 45048nt}, pages = {281-292}, abstract = {Spawning habitats of two eastern Mediterranean sardine, Sardina pilchardus (Walbaum, 1792), stocks ( coastal waters of central Aegean and Ionian Seas) are characterized from daily egg production method (DEPM) surveys conducted during the peak of the spawning period. The latter occurs earlier in the Aegean Sea ( December) than in the less-productive Ionian Sea ( February). Single-parameter quotient analysis showed that the preferred bottom depth for spawning was 40-90 m in both areas but sardine selected sites of increased zooplankton in the Aegean Sea during December and increased fluorescence in the Ionian Sea during February. Estimates of daily egg production (P) and spawning stock biomass ( B) were about four times lower for the Ionian Sea (P 7.81 eggs m(-2), B = 3652 tonnes) than the Aegean Sea (P=27.52 eggs m(-2), B = 16 174 tonnes). We suggest that zooplankton biomass might not be sufficient to support sardine reproduction in the highly oligotrophic Ionian Sea where the very small sardine stock may rely on the late-winter phytoplankton bloom. Actively selecting sites with increased zooplankton or phytoplankton and feeding plasticity (the well-known switching from selective particle feeding to non-selective filter feeding in sardines) are interpreted as adaptations to grow and reproduce optimally at varying prey conditions. Despite differences in temperature and productivity regimes, reproductive performance of sardine in the Ionian Sea was very similar to that in the Aegean Sea during the peak of the spawning period. In comparing adult parameters from DEPM applications to Sardina and Sardinops stocks around the world, a highly significant linear relation emerged between mean batch fecundity ( F) and mean weight of mature female ( W, g) (F = 0.364W, r(2) = 0.98). The latter implies that, during the peak of the spawning period, mean relative batch fecundity (eggs g(-1)) of sardine is fairly constant in contrasting ecosystems around the world.}, keywords = {anchovy, batch fecundity, biomass, eastern Mediterranean, Egg production, fish, Pisces, sagax, sardine, sea, single-parameter quotient analysis, walbaum, waters}, author = {Somarakis, S. and Ganias, K. and Siapatis, A. and Koutsikopoulos, C. and Machias, A. and Papaconstantinou, C.} } @article {12085, title = {Larval fish assemblages in coastal waters of central Greece: Reflections of topographic and oceanographic heterogeneity}, journal = {Scientia MarinaScientia Marina}, volume = {75}, number = {3}, year = {2011}, note = {Export Date: 8 November 2011Source: Scopus}, pages = {605-618}, author = {Somarakis, S. and Isari, S. and Machias, A.} } @proceedings {11465, title = {Reproductive parameters and somatic condition of anchovy, Engraulis encrasicolus (L., 1758) from the north eastern Aegean sea}, year = {2006}, month = {26-30.6.2006}, pages = {79}, publisher = {Hellenic Zoological Society}, address = {Patra}, keywords = {kape pisces}, author = {Schismenou, E. and Kallianiotis, A. and Machias, A. and Somarakis, S.} } @proceedings {10790, title = {Hydrology and biological features in the coastal areas of central Greece during the anchovy spawning period}, volume = {2}, year = {2000}, pages = {88{\textendash}93}, keywords = {Pisces}, author = {Ramfos, A. and Koutsikopoulos, K. and Fragopoulou, N. and Machias, A. and Somarakis, S. and Pyrovolaki, E. and Lykakis, I.} } @proceedings {9590, title = {Aspects of the ecology of the early life stages of ancovy, Engraulis encrasicolus (L., 1758), in the north east Aegean sea}, year = {2006}, month = {26-30.6.2006}, pages = {65}, publisher = {Hellenic Zoological Society}, address = {Patra}, keywords = {kape pisces}, author = {Nikolioudakis, N. and Machias, A. and Somarakis, S.} } @article {9271, title = {Batch fecundity of anchovy, Engraulis encrasicolus, in the NE Aegean Sea.}, journal = {Rapport et Proc{\'e}s-Verbaux des R{\'e}unions de la Commission Internationale pour l{\textquoteright}Exploration Scientifique de la Mer M{\'e}diterran{\'e}eRapport et Proc{\'e}s-Verbaux des R{\'e}unions de la Commission Internationale pour l{\textquoteright}Exploration Scientifique de la Mer M{\'e}diterran}, volume = {36}, year = {2001}, pages = {299}, keywords = {Pisces}, author = {Maraveya, E. and Somarakis, S. and Machias, A.} } @inbook {8963, title = {Small pelagics fish}, booktitle = {State of Hellenic Fisheries}, year = {2007}, pages = {192-207}, isbn = {978-960-98054-1-4}, author = {Machias, A. and Giannoulaki, M. and Somarakis, S. and Siapatis, A.}, editor = {Papaconstantinou, C. and Zenetos, A. and Vassilopoulou, V. and Tserpes, G.} } @article {8964, title = {Response of demersal fish communities to the presence of fish farms}, journal = {Marine Ecology Progress SeriesMarine Ecology Progress Series}, volume = {288}, year = {2005}, note = {Times Cited: 6ArticleEnglishCited References Count: 53916og}, pages = {241-250}, abstract = {The hypothesis that the presence of fish farms affects the communities of wild fish at large spatial scales was investigated through experimental trawl surveys. Three regions of the Aegean Sea with aquaculture zones were sampled in May and September (reproductive and recruitment periods, respectively for most species in the Aegean Sea). In each region, 2 sub-areas were sampled: 1 located nearby the fish farming zones (within 2 to 3 n mile) and a similar site ({\textquoteright}reference site{\textquoteright}) far away from these zones (> 20 n mile). Three replicate hauls were made in each sub-area for each of the 3 investigated regions. Significant differences were observed in community structure between farming and reference sites, which were mainly due to quantitative rather than qualitative aspects, The overall abundance and/or biomass of wild demersal fish was significantly higher near the fish farms in every region studied during May without any significant change in diversity or biodiversity. During the recruitment period in September, total abundance and biomass were fairly similar. These findings support the hypothesis that the presence of fish farms affects the wild fish populations in the oligotrophic eastern Mediterranean at a spatial scale larger than the immediate vicinity of fish cages. It seems that during the recruitment period all sites were stocked with fish close to the carrying capacity of the respective areas, and by late spring the areas close to fish farming zones had suffered little losses during winter, whereas populations at the reference sites had decreased substantially.}, keywords = {aquaculture, bathymetric distribution, CAGE FARM, CHEMICAL FLUXES, coastal sediments, Environmental impacts, Fish communities, fisheries, mass balances, Mediterranean, mediterranean-sea, Pisces, seagrass posidonia-oceanica, Taxonomic distinctness, wild fish}, author = {Machias, A. and Karakassis, I. and Giannoulaki, M. and Papadopoulou, K. N. and Smith, C. J. and Somarakis, S.} } @article {8965, title = {Changes in wild fish assemblages after the establishment of a fish farming zone in an oligotrophic marine ecosystem}, journal = {Estuarine, Coastal and Shelf ScienceEstuarine, Coastal and Shelf Science}, volume = {60}, number = {4}, year = {2004}, note = {Times Cited: 8ArticleEnglishCited References Count: 55845jt}, month = {AUG}, pages = {771-779}, abstract = {The species composition, abundance and diversity of demersal fish assemblages has been investigated in an oligotrophic coastal bay in the Aegean Sea which is a designated zone for the development of aquaculture. Samples were collected using experimental trawling, before the establishment of fish cages in the area during early June 1987 and after attaining the maximal production of the aquaculture zone in late May 2001. The overall abundance of the fish assemblage increased by a factor of 4 and the average trophic level of the fish community increased from 3.59 to 3.79. Traditional diversity indices showed an increase in dominance but the distinctness measures of biodiversity showed that the overall structure obtained after the establishment of fish farming was not phylogenctically impoverished. Multivariate analysis showed that the community differences between the two periods are quantitative rather than qualitative. Comparisons in length frequencies between the two periods indicated that specimens of the species compared were either similar or larger in the second period. The species favoured by the presence of aquaculture were not the ones normally feeding on the food pellets under the cages but those normally occurring in the fishing grounds of the study. It is concluded that the release of nutrients from fish farming in nutrient-poor systems can have a positive effect on local fisheries with no visible negative change in species composition or biodiversity. (C) 2004 Elsevier Ltd. All rights reserved.}, keywords = {aquaculture, biodiversity, CAGE FARM, CHEMICAL FLUXES, coastal sediments, Community structure, diversity, Environmental impact, fisheries, impact, mass balances, Mediterranean, mediterranean-sea, Pisces, seagrass posidonia-oceanica, Taxonomic distinctness}, author = {Machias, A. and Karakassis, I. and Labropoulou, M. and Somarakis, S. and Papadopoulou, K. N. and Papaconstantinou, C.} } @article {8966, title = {Sizes of discarded commercial species in the eastern-central Mediterranean Sea}, journal = {Fisheries ResearchFisheries Research}, volume = {66}, number = {2-3}, year = {2004}, note = {Cited By (since 1996): 3Export Date: 5 September 2006Source: ScopusReferences: Allen, M., Kilpatrick, D., Armstrong, M., Briggs, R., Perez, N., Course, G., Evaluation of sampling methods to quantify discarded fish using data collected during discard project EC 95/094 by Northern Ireland, England and Spain (2001) Fish. Res., 49, pp. 241-254; Alverson, D.L., Freeberg, M.H., Pope, J.G., Murawski, S.A., A global assessment of fisheries bycatch and discard (1994) FAO. Fish. Tech. Pap., 339, p. 233; Carbonell, A., Martin, P., De Ranieri, S., Discards of the western Mediterranean trawl fleets (1998) Rapp. Commun. Int. Mer. Medit., 35, pp. 392-393; Chen, Y., Gordon, G.N.G., Assessing discarding at sea using a length-structured yield-per-recruit model (1997) Fish. Res., 30, pp. 43-55; D{\textquoteright}Onghia, G., Tursi, A., Basanisi, M., Mastrototaro, F., Commercial trawling, discards and recruitment from a fishery of the north-western Ionian Sea (1997) Biol. Mar. Medit., 4 (1), pp. 291-297; D{\textquoteright}Onghia, G., Carlucci, R., Maiorano, P., Panza, M., Discards from deep-water bottom trawling in the eastern-central Mediterranean Sea and effects of mesh size changes (2003) Deep-sea Fisheries Symposium, , Havana, Cuba, September 2001. in press; Hall, S.J., (1999) The Effects of Fishing on Marine Ecosystems and Communities, 274p. , Blackwell Science, London; Jennings, S., Kaiser, M.J., The effects of fishing on marine ecosystems (1998) Adv. Mar. Biol., 34, pp. 201-352; MacHias, A., Vassilopoulou, V., Vatsos, D., Bekas, P., Kallianiotis, A., Papaconstantinou, C., Tsimenides, N., Bottom trawl discards in the N.E. Mediterranean Sea (2001) Fish. Res., 53, pp. 181-195; McCullagh, P., Nedler, J.A., (1989) Generalized Linear Models, 511p. , Chapman and Hall/CRC, London; Petrakis, G., Stergiou, K.I., Size selectivity of diamond and square mesh codends for four commercial Mediterranean fish species (1997) ICES J. Mar. Sci., 54, pp. 13-23; Ragonese, S., Zagra, M., Di Stefano, L., Bianchini, M.L., Effect of codend mesh size on the performance of the deep-water bottom trawl used in the red shrimp fishery in the Strait of Sicily (Mediterranean Sea) (2001) Hydrobiologia, 449, pp. 279-291; Smirniotis, E., Statistical report on landing in auction sites (1998) Fish. News (Athens), 208, pp. 85-88; Stergiou, K.I., Economidis, P., Sinis, A., Sex ratio, spawning season and size at maturity of red bandfish in western Aegean Sea (1996) J. Fish. Biol., 49, pp. 561-572; Stergiou, K.I., Christou, E.D., Georgopoulos, D., Zenetos, A., Souvermesoglou, C., Hellenic Seas: Physics, chemistry, biology and fisheries (1997) Oceanogr. Mar. Biol. Ann. Rev., 35, pp. 415-538; Stergiou, K.I., Economou, A., Papaconstantinou, C., Tsimenides, N., Kavadas, S., Estimates of discards in the Hellenic commercial trawl fishery (1998) Rapp. Commun. Int. Mer. Medit., 35, pp. 490-491; Stratoudakis, G., Fryer, R., Cook, R., Pierce, G., Fish discarded from Scottish demersal vessels: Estimators of total discards and annual estimates for targeted gadoids (1999) ICES J. Mar. Sci., 56, pp. 592-605; Tursi, A., Matarrese, A., D{\textquoteright}Onghia, G., Maiorano, P., Panza, M., Sintesi delle ricerche sulle risorse demersali del Mar Ionio (da Capo d{\textquoteright}Otranto a Capo Passero) realizzate nel periodo 1985-1997 (1998) Biol. Mar. Medit., 5 (3), pp. 120-129; Vassilopoulou, V., Papaconstantinou, C., Discarding at sea by commercial trawlers in Greek waters (1998) Rapp. Proc. Verb. Reun., 35 (2), pp. 502-503.}, month = {2004///}, pages = {213-222}, abstract = {Discard practices of trawlers in three main fishing areas in the Ionian Sea (eastern and western coast) and the Cyclades Islands (Aegean Sea) were considered using data obtained on board representative commercial vessels over five consecutive years (786 hauls). The length at which 50\% of the individuals were discarded (defined as discard size) was estimated for 29 species using logistic regression. In addition the lengths at which 25 and 75\% of individuals were estimated. The discard size seems to be a good measurement to study discarding, to compare differences between areas and to investigate the discarding procedure in relation to minimum landing size. The different cod end mesh size used in Greece and Italy (28 and 40mm, respectively) has no impact on the discarded sizes of the species, because the skippers tended to retain all marketable species and size (legal or not). In contrast to this procedure, the estimated L50s were very close to the legal sizes in the most cases. The minimum landing size seems to be an effective technical measure in Mediterranean fisheries only in combination with spatial and temporal prohibitions due to the numerous landing sizes that make the monitoring of landings by the authorities very difficult. The estimated discard sizes were probably affected by how strict the authorities were in monitoring the landings, the market demand of the species and other socio-economic aspects of fisheries. {\textcopyright} 2003 Elsevier B.V. All rights reserved.}, keywords = {Discarding sizes, discards, Mediterranean trawl species, Pisces}, author = {Machias, A. and Maiorano, P. and Vassilopoulou, V. and Papaconstantinou, C. and Tursi, A. and Tsimenides, N.} } @article {8967, title = {Settlement of the wreckfish (Polyprion americanus)}, journal = {Marine BiologyMarine Biology}, volume = {142}, number = {1}, year = {2003}, note = {Export Date: 5 September 2006Source: ScopusReferences: Alexander, R.Mc.N., Functional design in fishes (1970) Swimming, pp. 19-45. , Hutchinson, London; (2001) The State of the European Wreckfish (Polyprion americanus) Stocks, , Report to the EU (DGXIV), project 98/041. European Commission, Brussels; Ball, A.O., Sedberry, G.R., Zatcoff, M.S., Chapman, R.W., Carlin, J.L., Population structure of wreckfish Polyprion americanus determined with microsatellite genetic markers (2000) Mar Biol, 137, pp. 1077-1090; Bombace, G., Ittiofauna e produzione terziaria del coralligeno di substrato duro della costa settentrionale di Sicilia (1972) Quad Lab Tecnol Pesca, 3, pp. 23-37; Cop, H.G., Kovac, V., When do fish with indirect development become juveniles? (1996) Can J Fish Aquat Sci, 53, pp. 746-752; Fischer, W., Bauchot, M.L., Schneider, M., (1987) Fiche FAO d{\textquoteright}Identification des Espe?ces pour les Besoins de la Pe?che, Rev 1. Me?diterrane?e et Mer Noire (Zone de Pe?che 37), , FAO, Rome; Fryer, R.I., A model of between-haul variation in selectivity (1991) ICES J Mar Sci, 48, pp. 281-290; Fuiman, L.A., Growth gradients in fish larvae (1983) J Fish Biol, 23, pp. 117-123; Fuiman, L.A., Poling, K.R., Higgs, D.M., Quantifying developmental progress for comparative studies of larval fishes (1998) Copeia, 3, pp. 602-611; Fukuhara, O., Morphological and functional development of larval and juvenile Limanda yokohamae (Pisces: Pleuronectidae) reared in the laboratory (1988) Mar Biol, 99, pp. 271-281; Hewitt, R., The value of pattern in the distribution of young fish (1981) Rapp P-V Reun Cons Int Explor Mer, 178, pp. 229-236; Karakassis, I., Eleftheriou, A., The continental shelf of Crete: Structure of macrobenthic communities (1997) Mar Ecol Prog Ser, 160, pp. 185-196; Kentouri, M., Papandroulakis, N., Divanach, P., Species diversification in Greek finfish mariculture (1995) Cah Options Mediterr, 14, pp. 129-136; Kingsford, M.J., Biotic and abiotic structure in the pelagic environment: Importance to small fishes (1993) Bull Mar Sci, 53, pp. 393-415; Kirincic, J., Lepetic, V., Recherches sur l{\textquoteright}ichthyobenthos dans les profondeurs de l{\textquoteright}adriatique me?ridionale et possibilite? d{\textquoteright}exploitation au moyen de palangres (1955) Acta Adriat, 7, pp. 3-113; Koumoundouros, G., Divanach, P., Kentouri, M., Ontogeny and allometry plasticity of Dentex dentex (Osteichthyes: Sparidae) in rearing conditions (1999) Mar Biol, 135, pp. 561-572; Koumoundouros, G., Divanach, P., Anezaki, L., Kentouri, M., Temperature-induced ontogenetic plasticity in sea bass (Dicentrarchus labrax) (2001) Mar Biol, 139, pp. 817-830; Labropoulou, M., Machias, A., Effects of habitat selection on the dietary patterns of two triglid species (1998) Mar Ecol Prog Ser, 173, pp. 275-288; Lovett, D.L., Felder, D.L., Application of regression techniques to the studies of relative growth in crustaceans (1989) J Crustac Biol, 9, pp. 529-539; Machias, A., Somarakis, S., Tsimenides, N., Bathymetric distribution and movements of red mullet Mullus surmuletus (1998) Mar Ecol Prog Ser, 166, pp. 247-257; Macpherson, E., Duarte, C.M., Bathymetric trends in demersal fish size: Is there a general relationship? (1991) Mar Ecol Prog Ser, 71, pp. 103-112; Papandroulakis, N., Divanach, P., Kentouri, M., Specific diversification in finfish mariculture: The Mediterranean case (1997) Proceedings of the International Conference in Martinique, pp. 223-224. , Spec Publ Eur Aquacult Soc Book of abstract; Petrakis, G., Stergiou, K.I., Size selectivity of diamond and square mesh codends for four commercial Mediterranean fish species (1997) ICES J Mar Sci, 54, pp. 13-23; Regner, S., Dulcic, J., Growth of sea bass, Dicentrarchus labrax, larval and juvenile stage and their otoliths under quasi-steady temperature conditions (1994) Mar Biol, 119, pp. 169-177; Roberts, C.D., The wreckfish Polyprion americanus (Schneider, 1801) in Irish waters: An underwater sighting and review of the Irish records (1977) Ir Nat J, 19, pp. 108-112; Roberts, C.D., Reproductive mode in the percomorph fish genus Polyprion Oken (1989) J Fish Biol, 34, pp. 1-9; Sagnes, P., Gaudin, P., Statzner, B., Shift in morphometrics and their relation to hydrodynamic potential and habitat use during grayling ontogenesis (1997) J Fish Biol, 50, pp. 846-858; Schaeffer, B., Rosen, D.E., Major adaptive level in the evolution of the actinopterygian feeding mechanism (1979) Reading in Ichthyology, pp. 95-111. , Love MS, Cailliet GM (eds). Goodyear, Calif; Schmidt-Nielsen, K., (1984) Scaling, Why is Animal Size so Important?, , Cambridge University Press, Cambridge; Sedberry, G.R., Ulrich, G.F., Applegate, A.J., Development and status of the fishery for wreckfish (Polyprion americanus) in the southeastern United States (1994) Proc Gulf Caribb Fish Inst, 43, pp. 168-192; Sedberry, G.R., Carlin, J.L., Chapman, R.W., Eleby, B., Population studies in the pan-oceanic wreckfish, Polyprion americanus (Teleostei: Polyprionidae), as indicated by mtDNA variation (1996) J Fish Biol, 49 (SUPPL. A), pp. 318-329; Sedberry, G.R., Carlin, J.L., Menezes, G.M., Movements of a pelagic-phase wreckfish, Polyprion americanus (Schneider, 1801), as indicated by tag and recapture (1998) Arquipel Bull Univ Azores Life Mar Sci A, 16, pp. 69-72; Sedberry, G.R., Andrade, C.A., Carlin, J.L., Chapman, R.W., Luckhurst, B.E., Manooch, C.S., Menezes, G., (...), Ulrich, G.F., Wreckfish Polyprion americanus in the North Atlantic: Fisheries, biology, and management of a widely distributed and long-lived fish (1999) Am Fish Soc Symp, 23, pp. 27-50; Somarakis, S., Machias, A., Age, growth and bathymetric distribution of red pandora (Pagellus erythrinus) on the Cretan shelf (eastern Mediterranean) (2002) J Mar Biol Assoc UK, 82, pp. 149-160; Somarakis, S., Catalano, B., Tsimenides, N., Catchability and retention of larval European anchovy, Engraulis encrasicolus, with bongo nets (1998) Fish Bull (Wash DC), 96, pp. 917-925; Stefanescu, C., Rucabado, J., Lloris, D., Depth-size trends in western Mediterranean demersal deep-sea fishes (1992) Mar Ecol Prog Ser, 81, pp. 205-213; Stergiou, K.I., Economidis, P., Sinis, A., Sex ratio, spawning season and size at maturity of red bandfish in western Aegean Sea (1996) J Fish Biol, 49, pp. 561-572; Suquet, M., Normant, Y., Severe, A., Barone, H., Fostier, A., Le Delliou, H., Fauvel, C., Growth performances of the wreckfish (Polyprion americanus) in captivity (2001) Larvi 2001. Spec Publ Eur Aquacult Soc, 30, pp. 586-589; Tortonese, E., (1975) Fauna d{\textquoteright}Italia. Osteichthyes, 11. , Calderini, Bologna; Tuck, I.D., Atkinson, R.J.A., Chapman, C.I., Population biology of the Norway lobster, Nephrops norvegicus (L.) in the Firth of Clyde, Scotland. II. Fecundity and size at onset of sexual maturity (2000) ICES J Mar Sci, 57, pp. 1227-1239; Warburton, K., Blaber, S.J.M., Pattern of recruitment and recourse use in a shallow-water fish assemblages in Moreton Bay, Queensland (1992) Mar Ecol Prog Ser, 90, pp. 113-126; Webb, P.W., Locomotor pattern in the evolution of actinopterygian fishes (1982) Am Zool, 22, pp. 329-342.}, month = {2003///}, pages = {45-52}, abstract = {The wreckfish (Polyprion americanus) is a panoceanic, long-lived, deep-water demersal species, characterized by an extended pelagic juvenile phase associated with floating objects. In the present study morphometric data from 435 specimens collected from Greece (Crete), Italy (Ionian Sea) and the Atlantic coast of France from September 1999 to March 2001 were analyzed to estimate the settlement size of the species and associated changes in morphology. The fishery sample included specimens from both the pelagic and the demersal stage. Length-at-settlement (TL50) and 95\% confidence intervals were estimated by fitting a logistic function. Eleven morphometric characters were analyzed, and the existing inflection points, reflecting alterations in body shape, were defined: (1) iteratively, as the transition point, splitting the data set into two groups, for which the reduced major axis functions, between a character and total length, of the successive groups best fit (minimum sum of squares of residuals) the combined data set and (2) where the second derivative of the fitted third-order polynomial functions to morphometric ratios equaled zero. The main size range within which wreckfish settled was 56-65 cm, and the means of the inflection points defined by the two methods were 61 and 64 cm. These results indicate changes in functional morphology associated with settlement. The monitoring of wreckfish juveniles caught in the wild and kept individually in captivity showed changes in growth and food intake at approximately the estimated settlement length and suggested that temperature was the most likely factor triggering settlement.}, keywords = {Pisces}, author = {Machias, A. and Somarakis, S. and Papadroulakis, N. and Spedicato, M.-T. and Suquet, M. and Lembo, G. and Divanach, P.} } @article {8968, title = {Bathymetric distribution and movements of red mullet Mullus surmuletus.}, journal = {Marine Ecology Progress SeriesMarine Ecology Progress Series}, volume = {166}, year = {1998}, pages = {247-257}, author = {Machias, A. and Somarakis, S. and Tsimenides, N.} } @article {8969, title = {Ring formation on otoliths and scales of Pagrus pagrus: a comparative study}, journal = {Journal of Fish BiologyJournal of Fish Biology}, volume = {52}, number = {2}, year = {1998}, pages = {350-361}, publisher = {Blackwell Synergy}, keywords = {Pisces}, author = {Machias, A. and Tsimenides, N. and Kokokiris, L. and Divanach, P.} } @article {8970, title = {Bottom trawl discards in the northeastern Mediterranean Sea}, journal = {Fisheries ResearchFisheries Research}, volume = {53}, number = {2}, year = {2001}, pages = {181-195}, publisher = {Elsevier Science}, keywords = {Pisces}, author = {Machias, A. and Vassilopoulou, V. and Vatsos, D. and Bekas, P. and Kallianiotis, A. and Papaconstantinou, C. and Tsimenides, N.} } @article {8394, title = {Effect of habitat selection on the dietary patterns of two triglid species}, journal = {Marine Ecology Progress SeriesMarine Ecology Progress Series}, volume = {173}, year = {1998}, pages = {275-288}, keywords = {Pisces}, author = {Labropoulou, M. and Machias, A.} } @proceedings {8395, title = {Patterns of resource partitioning of marine demersal fish.}, year = {1999}, month = {17-21 May 1999}, pages = {83}, publisher = {Hellenic Zoological Society}, address = {Kavala}, keywords = {kape pisces}, author = {Labropoulou, M. and Machias, A.} } @article {8396, title = {Habitat selection and diet of juvenile red porgy, Pagrus pagrus (Linnaeus, 1758)}, journal = {Fishery BulletinFishery Bulletin}, volume = {97}, number = {3}, year = {1999}, note = {Cited By (since 1996): 6Export Date: 6 September 2006Source: ScopusReferences: Azeta, M., Ikemoto, R., Azuma, M., Diurnal activity rhythms in 0-group red sea bream, Pagrus major (1980) Bull. 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Syst., 15, pp. 393-425; Werner, E.E., Gilliam, J.F., Hall, F., Mittelbach, G.G., An experimental test of the effects of predation risk on habitat use in fish (1983) Ecology, 64, pp. 1540-1548; Werner, E.E., Hall, D.J., Ontogenetic habitat shifts in bluegill: The foraging-predation risk trade-off (1988) Ecology, 69, pp. 1352-1366. , Biostatistical analysis, 2nd ed. Prentice-Hall, Englewood Cliffs, NJ, 718 p.}, month = {1999///}, pages = {495-507}, abstract = {The patterns of distribution and feeding habits of juvenile red porgy, Pagrus pagrus, were studied for fish collected in experimental trawl surveys carried out along the Cretan continental shelf over a period of four years. Abundance increased significantly in shallow waters, with a maximum between 20 and 50 m for all seasons, negatively correlated to depth and positively correlated to temperature. Patterns of bathymetric distribution were similar for all sizes of juvenile red porgy, varying little among seasons. The fact that no specimens larger than 219 mm FL were caught in the trawlable fishing grounds indicates that larger individuals aggregated over hardbottom areas that could not be sampled by trawling. Feeding intensity varied among the size classes of fish examined. Stomach-content analysis revealed that juvenile red porgy are carnivorous, feeding mainly on decapods. Diet composition did not vary seasonally; decapods were the most important prey throughout the year. However, the composition of the prey consumed varied considerably with predator size, coupled with differences in mean prey sizes found in each size class. Feeding rates of juveniles in terms of both feeding intensity and amount of food consumed were high and increased with fish size. The Cretan continental shelf habitat offers increased growth rate, reduced predation risk, and increased food abundance to juveniles and therefore they direct energy entirely into somatic growth. Juvenile red porgy appeared to be a separate unit, from a management as well as from an ecological point of view. Habitat segregation is of importance; juvenile specimens were differentiated from mature fish on the basis of their selection of bottom type and prey and to a lesser extent by depth.}, keywords = {Pisces}, author = {Labropoulou, M. and Machias, A. and Tsimenides, N.} } @conference {2157, title = {Distribution of Anchovy and Sardine in N. Aegean Sea in June 1995}, booktitle = {ΕΛΛΗΝΙΚΗ ΕΤΑΙΡΕΙΑ ΒΙΟΛΟΓΙΚΩΝ ΕΠΙΣΤΗΜΩΝ - 18{\textdegree} ΠΑΝΕΛΛΗΝΙΟ ΣΥΝΕΔPΙΟ}, year = {1996}, month = {17-19 ΑΠΡΙΛΙΟΥ}, publisher = {ΕΛΛΗΝΙΚΗ ΕΤΑΙΡΕΙΑ ΒΙΟΛΟΓΙΚΩΝ ΕΠΙΣΤΗΜΩΝ}, organization = {ΕΛΛΗΝΙΚΗ ΕΤΑΙΡΕΙΑ ΒΙΟΛΟΓΙΚΩΝ ΕΠΙΣΤΗΜΩΝ}, address = {ΚΑΛΑΜΑΤΑ}, keywords = {Aegean, anchovy, distribution, marine, sardine, Αιγαίο, γαύρος, διανομή, θαλάσσιο ψάρι, σαρδέλα, ψάρια}, author = {Machias, A. and Somarakis, S. and Kapandagakis, A. and Tsimenides, N} } @conference {2000, title = {Spatial Modelling of the European Anchovy Habitat in the Eastern Mediterranean Basin Using GAMS and GIS Technology}, booktitle = {10th International Congress on the Zoogeography and Ecology of Greece and Adjacent Regions}, year = {2006}, month = {26-30 June}, publisher = {Hellenic Zoological Society, Hellenic Ornithological Society, Hellenic Ministry of Rural Development, Section of Animal Biology (Dept. Of Biology, Univ. of Patras)}, organization = {Hellenic Zoological Society, Hellenic Ornithological Society, Hellenic Ministry of Rural Development, Section of Animal Biology (Dept. Of Biology, Univ. of Patras)}, address = {Patras}, keywords = {anchovy, GAMs, GIS, habitat, model, modelling, spatial, γαύρος, ενδιαίτημα, μοντέλο, μοντελοποίηση, χωρικός}, author = {Giannoulaki, M. and Machias, A. and Valavanis, V. and Somarakis, S. and Papaconstantinou, C.} }