Age, growth and mortality of a semi-isolated lagoon population of sand smelt, Atherina boyeri (Risso, 1810) (Pisces: Atherinidae) in an estuarine system of northern Greece

Publication Type:Miscellaneous
Year of Publication:2004
Authors:Koutrakis, E. T., Kamidis, N. I., Leonardos, I. D.
Abstract:

Age, growth and mortality of the sand smelt, Atherina boyeri (Risso, 1810), were studied in the Vistonis estuarine system in northern Greece from February 1989 to August 1990. Overall male : female sex ratio was 1 : 2.5, statistically different from unity. Total lengths ranged between 13 and 105 mm. Age determination based on scale readings showed that the population comprised five age-groups. Sand smelt grew allometrically (b = 3.22) and rapidly during the first year, achieving 60% of their growth. Growth parameters of the population were: L? = 116.97 mm, K = 0.35 year-1 and to = -0.99 years. Growth index ö? was 3.69 of all individuals studied. The mean growth index was significantly lower for the Mediterranean lagoon ((ö? = 3.73, SD = 0.1) than for Atlantic populations (ö? = 3.92, SD = 0.06). Total mortality rate was Z = 1.29 year-1 and natural mortality M = 0.95 year-1. Males had a lower life span than females, the latter dominating length classes > 60 mm. Exploitation rate of the studied population was E = 0.26, suggesting that stock size might increase and generate improved possibilities for exploitation. © 2004 Blackwell Verlag, Berlin.

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