Evaluation of catch and stocks of common kilka Clupeonella cultriventris caspia in the Iranian coastal of the Caspian Sea (2018-19)

The main objectives of the present study were to estimate of catch age structure ، biomass and maximum sustainable yield of common kilka in Iranian waters of the Caspian Sea. The result shown that catch of kilka in Iranian coastal in 2018 decreased from 26153 ton to 24586 ton in 2019. The mean length was 104.3±10.6 at the same time and the minimum and maximum fork lengths were 52.5 and 137.5 mm and always fishes with 3 and 4 year olds had the highest frequency 78.1 and 80.6 percent respectively. The biomass of common kilka was estimated 76922.9 and 74342.7 ton, respectively. In these years, fish of the 3 year of this fish had the highest amount of reserves (respectively 24677.6 and 24254.8 ton) and the lowest reserves for 6-year-old fish, respectively. The breeders biomass of this species is 39557.4 and 36939.4 tons respectively and the ratio of biomass of broodstocks to the whole was 51.4 and 49.6 percent respectively. Acceptable Biological Catch was estimated 19500 tons , with a very cautious approach. The fishing mortality was more than reference points of common kilka at F0.1 and F40% (0.92 and 0.80) , In fact overfishing has occurred . Proper exploiting leads to continuous harvest and long-term stability of storage.