Research Article: Reproductive biology of the blackchin tilapia (Sarotherodon melanotheron) in the marine protected area of Niamone-Kalounayes (Casamance estuary, Senegal)

S. Alassane; D. Patrick; N. Waly; S. Ousseynou; T. Marème; L.B. Alexandre

Research Article: Reproductive biology of the blackchin tilapia (Sarotherodon melanotheron) in the marine protected area of Niamone-Kalounayes (Casamance estuary, Senegal)

محل انتشار: مجله علوم شیلات ایران، دوره: 22، شماره: 5

سال انتشار: 1402

نوع سند: مقاله ژورنالی

زبان: انگلیسی

مشاهده: 24

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لینک ثابت به این مقاله:

https://civilica.com/doc/1916089

شناسه ملی سند علمی:

JR_JIFRO-22-5_008

تاریخ نمایه سازی: 29 بهمن 1402

چکیده مقاله:

Knowledge of the reproductive biology of fish is essential for the local fish population management in marine protected areas. The objective of the present study is to determine the sex ratio, reproductive period, and sexual maturity size classes of the blackchin tilapia (Sarotherodon melanotheron) in the marine protected area of Niamone-Kalounayes, located in Casamance, Senegal. A total of ۴۷۱ individuals including ۳۰۵ females and ۱۶۶ males were sampled from June ۲۰۲۱ to July ۲۰۲۲, using an experimental beach seine (۲۵۰ m long, ۲۵ mm side mesh). The sex ratio (M: F = ۱.۰: ۱.۸) was in favor of females. The size at first sexual maturity (Lm۵۰) was obtained ۱۱.۰۰ cm for males and ۱۱.۷۱ cm for females. The seasonal variation in the gonadosomatic index (GSI) indicates that this population has an extended reproduction period, ranging from March to September, with a clear peak in March, followed by a period of sexual rest (October-December), and a period of maturation of the gonads from January through March. Results of this investigation provided insights for better management practices for this specie.

کلیدواژه ها:

Reproductive biology ، Sarotherodon melanotheron ، Sex ratio ، Maturity ، GSI Senegal

نویسندگان

S. Alassane