Stock assessment of bony fishes in the Iranian Coastal water of the Caspian Sea (2003-2004)

Abstract

For gathering of data on biometry and catch statistics, 5 mobile working group in the regions of Anzali , Kiashahr , Noshahr , Babolsar and Torkmen were involved from the start ( 2004 / 10 / 03 ) to the end of fishing season ( 2005 / 04 / 10 ) . gathered data Were entered to the computer based on species. For data analysis different methods Were undertaken such as Bertalanfy equation for growth parameter Beverton and Holt for total mortality rates, pauly's imperical model for natural mortality rate and cohort Analysis for biomass estimation. Totall catch with taking into account of pauching , estinmated 15500 tonnes reported by scientific committee of catch and fishing harbor relief of Iranian Fishery Company .The total recorded catch of beach seine cooperatives was 10667 tons that comprise 69% of the total catch . Total catch of Caspian Kutum was estimated 8477 tons that had 2500 tons decrease with comparison of the last year. Biomass of Caspian kutum in Iranian coastal Water of the Caspian sea in 2003 2004 estimated about 25000 tons. The catch of pick perch in 2003 2004 decreased with comparison of the last year and estimated about 38 tons from which 15 tons were caught by beach seine cooperatives . Most of the catch of pick perch was immature and undersize. Approximately all of the catch is due to releasing of fingerling of this species by fishery company. Totall catch of bream was estimated 26.3 tons from which 15.4 tons were caught by beach seine cooperatives . Most of which was immature and undersize.