@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.}
}
@article {12084,
	title = {Spawning habitat and daily egg production of sardine (<i>Sardina pilchardus</i>) 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.}
}
