The stock assessment of bony fish, carp(Cyprinus carpio) and roach (Rutilus rutilus) in southern coast of the Caspian Sea

Abstract

In this study, the combination of length, growth rate, mortality rate and also the current of status Operation Carp and roach commercially as important species in southern waters were reviewed. Samples were taken from beach sine net catch and fish were offered at fish market. The age composition of carp and roach was 1 to 16 and 1 to 4 years respectively, most catch carp and roach was in length range of 31 to 39 cm and 18 to 20 cm respectively. Growth parameters during the program by ELFFAN I FiSAT for Carp and Roach obtained from von Bertalanffy growth function were L∞ =70.78 and 32.39 cm, K = 1.24/year and 1.24/year; respectively. the growth parameters such as infinite length( L∞), growth coefficient (K) and t0 age zero base on One Brtalnfy equation estimated, 78/70, 0/14, 32/39, 0/5 ,-0 / 5 Total mortality coefficient Using the method of catch curve (Z), natural mortality rate using the empirical formula Pauli( M) , fishing mortality (F) using the formula F = Z - M and Growth performance index (Ǿ) for Carp and Roach were obtained 1.5year-1,0.9year-1,0.5year-1,0.26year-1,1.24,0.4,2.85 and 2.54 respectively. The biomass (B) and Maximum Sustainable Yield (MSY) with the present effort for Carp and Roach were estimated 1628.7t, 368.9t and88.06t, and 32.7t respectively.