Papers/Abstracts

Growth traits of two sturgeon species, Acipenser gueldenstaedtii and Acipenser nudiventris, in the Iranian waters of the Caspian Sea

Shima Bakhshalizadeh, Ali Bani1 and Shahram Abdolmalaki

aqua International Journal of Ichthyology,  pp. 154-164, Volume 21 issue 4, 15 October 2015

Abstract

The life history traits of the Russian sturgeon, Acipenser gueldenstaedtii, and ship sturgeon, Acipenser nudiventris, obtained from Iranian coastal waters of the Caspian Sea, were studied through analysis of the pectoral fin spine section. The specimens were obtained from commercial fisheries between October 2008 and June 2010.The interpretation of growth bands in the pectoral fin spine sections was carried out objectively using the direct reading of thin sections and by image analysis. The maximum age recorded for the specimens of Russian sturgeon and ship sturgeon were 27 and 32 years respectively. The estimates of asymptotic length (L∞) and the growth coefficient (K) of Russian sturgeon were 180.95 cm and 0.07 per year respectively. Ship sturgeon had an asymptotic length of 190.67 cm and a growth coefficient of 0.15 per year. The total mortality coefficient (Z) for Russian sturgeon and ship sturgeon were estimated to be 1.14 and 0.79 per year respectively. Annual mortality rates were calculated at 68 percent for Russian sturgeon and 55 percent for ship sturgeon. This study revealed high mortality, low survive rate of studied species that is due to fishing pressure and degradation of environmental conditions. The knowledge of life history of Russian sturgeon and the ship sturgeon in the Iranian Waters of the Caspian Sea have implication in management of the sympatric Russian sturgeon and the ship sturgeon stocks.

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