Journal of Marine Biology

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The marine survey for sturgeon stock assessment was conducted to estimate the abundance of each species, total abundance, biomass and their percentage composition. Trawling was carried out in 90 stations that were selected using a random stratified design. In each station trawling carried out up to 30 minute and with 2.5-3 knot speed. In Autumn 2001 totally 127 sturgeon specimens were caught including 90 A. persicus specimens, 34 A. stellatus, 2 A. nudiventrisand 2 Husohuso specimens. The catch composition comprised 70.3% A. persicus, 26.5% A. stellatus, 1.56% A. nudiventrisand 1.56% Husohuso. But in Autumn 2009 totally 62 sturgeon specimens were totally caught including 52 A. persicus specimens, 8 A. stellatus, and 2 A. gueldenstaedtii specimens. The catch composition comprised 83.9% A. persicus, 12.9% A. stellatus, and 3.2% A. gueldenstaedtii.Relative abundance of sturgeons caught in bottom trawls in autumn 2001 was 1.69 specimens per trawl, but in autumn 2009 were 0.69 specimens per trawl. The estimated total abundance of sturgeons in the autumn 2001 survey was 7930 thousand and in survey of autumn 2009 was 3463 thousand specimens. The estimated biomass of sturgeons in the Iranian waters of Caspian Sea in autumn 2001 was 5518.1 tons and in autumn 2009 3014.3 tons .the absolute abundance of commercial sturgeon in autumns 2001and2009were 281330 and 277677 respectively.The biomass of commercial sturgeon sturgeon was estimated 5518.1 tons in autumn2001, while it was 2193.5 tons in autumn 2009.

Keywords: Stock assessment, Sturgeon, South Caspian Sea region, catch per unit effort

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