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Relationship Between Biological Egg Characteristics and Female Brood Fish in Stellate Sturgeon, Acipenser Stellatus Pallas, 1771 (Pisces: Acipenseridae) in the Southeast Caspian Sea, Iran
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نویسنده
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یلقی س ,مظاهری کوهانستانی ز ,قربانی ر ,خوشباور رستمی ح
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منبع
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Caspian Journal Of Environmental Sciences - 2013 - دوره : 11 - شماره : 2 - صفحه:195 -203
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چکیده
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Fecundity is one of the important indicators of reproduction biology in fishes especially in rearing andrestocking management of endangered species such as sturgeon. the fecundity of stellate sturgeon (acipenserstellatus pallas, 1771) was studied in 50 specimens captured by gill net (mesh size= 100 mm) and seine net indifferent fishing areas along the southeastern part of the caspian sea from october 2004 through june2005.some biological characteristics of eggs (including diameter, surface-to-volume ratio of egg) and of fish(including age, fork length, weight, fecundity and gonadosomatic indices) were determined, and therelationship between them was defined. the results obtained showed that eggs were in stage f5 ofdevelopment, and mean fork length, weight, age, fecundity and gonadosomatic indices were 125.26±8.01 (cm),10.3±1.97 (kg), 12±1.34 (years), 170730±43211.11 and 20.88±3.19 (%), respectively. also, the average eggdiameter and surface-to-volume ratio were 2.92±1.44 (mm) and 2.06±0.12 (mm-1), respectively. positivecorrelation was detected between egg diameter and surface, and volume, while negative correlation was foundbetween egg diameter and surface-to-volume ratio. weight, length and age have linear relationships withabsolute fecundity and age was the best predicator of fecundity (r2= 0.848, f=27.962 and p value=0.003).
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کلیدواژه
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Acipenser Stellatus ,Biological Characters ,Caspian Sea ,Egg ,Fecundity
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آدرس
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مرکز تحقیقات ذخایر آبزیان آبهای داخلی, ایران, دانشگاه علوم کشاورزی و منابع طبیعی گرگان, ایران, دانشگاه علوم کشاورزی و منابع طبیعی گرگان, ایران, دانشگاه علوم کشاورزی و منابع طبیعی گرگان, ایران
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Authors
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