Characteristics of biological influence on the growth and feed index of the sand smelt fish (Atherina boyeri caspia Eichwald, 1838) on the southeast coast of the Caspian Sea

Objective of the present study examines some biological characteristics of the sand smelt in the southeast coast of the Caspian Sea (between of Gohar Baran and Neka power house) in Mazandaran province. Accordingly, some of the biological characteristics such as age, sex, growth and nutritional parameters were studied. The mean (±SD) total length and weight were 8.48±1.21 cm and 3.81±1.48 kg, respectively. There is a significant correlation between them (P