Reproduction biology of chub living in Lake Hafik

In this study, the reproductive biology of chub population in Hafik Lake was investigated. ۲۴۲ samples were caught between April and November ۲۰۰۹. The age of S. cephalus samples were found to range between I-VIII in addition, ۱۵۳ of them were female and ۸۹ were male. Their fork lengths changed between ۱۱۴-۳۳۲ mm, and body weights were between ۲۲.۵ and ۵۵۰.۳ g. Male specimens were determined to reach sexual maturity at II and III age, while females reached at III and IV years of age. The smallest female individual at sexual maturity had ۱۱۴ mm of fork length and ۲۷.۳ g, while the smallest male at sexual maturity had ۱۱۸ mm of fork length and ۲۴.۲ g. The mean gonadosomatic index of male and female specimens were found highest in April (۱۲.۳۳, ۸.۰۲) and May (۸.۳۷, ۴.۶۴) and minimum in August (۲.۳۹, ۱.۲۲). Egg diameters of chub individuals were measured between ۳۴۳ µm and ۱۹۰۰ µm. The egg number in per one gram ovary was maximum in August, and minimum in April and May. S. cephalus was determined to lay eggs in Hafik Lake towards the end of April, which continued until the end of July. Maximum fecundity in population was observed as ۱۵۱۳۰۲ in the specimen at the age of VI.

کلیدواژه ها:

Chub ، gonad development ، Hafik Lake