Reproduction biology of chub living in Lake Hafik
محل انتشار: مجله علوم شیلات ایران، دوره: 11، شماره: 3
سال انتشار: 1391
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 100
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شناسه ملی سند علمی:
JR_JIFRO-11-3_018
تاریخ نمایه سازی: 22 اسفند 1400
چکیده مقاله:
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.
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