537 Study of the natural and fishing mortality and exploitation rates of bigeye kilka (Clupeonella grimmi) in the southeast part of the Caspian Sea (Babolsar)
The natural, fishing and total mortality survival and exploitation rates of bigeye kilka were studied. The
survival rate and natural mortality were calculated using catch curve and Pauly methods, respectively.
Natural and fishing mortality have been estimated up to 0.881 and 0.309 yr-1, respectively. According to
the catch curve method, the annual survival rate of bigeye kilka has been estimated to be 0.304 yr-1.
Owning to this survival rate, the instantaneous coefficient of the total mortality of bigeye kilka has been
estimated up to 1.19 yr-1, while the exploitation rate of bigeye kilka has been estimated up to 0.260. The
catch amounts of bigeye kilka decreased gradually mainly due to overfishing, predators and ecological
disturbances which occurred in the Caspian Sea. Using the conclusion of this study and the previous
studies of other researchers, it is suggested that the population of bigeye kilka were overexploited in
the past years and were vulnerable to their natural predators.
Key words: Clupeonella.grimmi, natural mortality, fishing mortality, total mortality, survival rate, exploitation
rate.

دانلود فایل پوستی

تاریخ انتشار:
Shortcut keys: Prev=Right , Next=Left
موضوعات مرتبط
گزارش صادرات آبزیان کشور در سال 1400 بررسی اسیدهای چرب غیر اشباع در ماهی تیلاپیا و تاثیر بر بدن انسان بررسی مرفولوژیک و برخی خصوصیات زیست شناسی ماهی مخرج لوله ای (Rhodeus Sericeus) در رودخانه های هراز و محمود آباداستان مازندران حفاظت از اكولوژي درياي خزر، توسعه و بهره ‌وري پايدار تهیه فرآورده كتلت ماهي Fish cake از فیله ماهی بيگ هد بهبود رشد لارو تاسماهي ايراني توسط دافني غني سازي با روغن كبد ماهي رسوبات ميكروفلور بررسی اثر سطوح مختلف مکمل آنزيمي ناتوزیم پلاس بر عملکرد ماهی قزل آلای رنگین کمان در جيره حاوي کنجاله کانولا فوايد و کاربرد پروبيوتيک ها در جيره غذايي ماهی و ميگو ارزش تغذیه ای کنجاله کانولا فرآوری شده در جیره ماهیان اثر متقابل سلنيوم و چربي بر ترکيب اسيد چرب بافت ماهي قزل آلاي رنگين کمان Population dynamics and biological characteristics of kilka species (Pisces: Clupeidae) in the southeastern coast of the Caspian Sea Study of Natural and Fishing Mortality and Exploitation Rate of Common Kilka Clupeonella cultriventris in Southeast Part of the Caspian Sea (Babolsar) Study of Natural and Fishing Mortality and Exploitation Rate of Anchovy Kilka Clupeonella engrauliformis in Southeast Part of the Caspian Sea (Babolsar)
رفتن به بالای صفحه