The project was carried out in the southern coastal areas of the Caspian Sea measuring length, weight and age of more than 30,000 fishes together with recording of relevant fishing information. Also age-weight, length-weight and age-length relationships was calculated for the separate species and total and natural mortality rates was determined. Furthermore biomass assays. Cohort analysis, and stock assessment of different fish species was conducted and maximum sustainable yield determined. The results showed that nearly 90% of the catch is composed of Rutilus frisii kutum, Mugil saliens and Mugil auratus. Total biomass of the mentioned fishes was estimated to be. 24000, 7000 and 2400 tones with the, maximum sustainable yield being 7000, 2900 and 960 ton respectively
