نوع مقاله : مقاله کامل علمی - پژوهشی
نویسنده
استادیار پژوهشکده اکولوژی خلیج فارس و دریای عمان. موسسه تحقیقات علوم شیلاتی کشور. سازمان تحقیقات و آموزش و ترویج کشاورزی.بندرعباس ایران
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسنده [English]
Considering the importance and need of Fisheries organization in the direction of reproduction and breeding of cobia due to its high growth rate and the lack of comprehensive research on the biology of this fish in Iran, reproduction biology of cobia (Rachycentron canadum) were investigated from October 2021 to December 2022(12 months) in waters of Hormozgan province (northen part of Persian Gulf) from the western end (Javad Al-Aimeh port) to the eastern end (Gabrik port). The reproduction cycle, sexual maturity, sex ratio, Fecundity, Lm50 of cobia were studied from total of 509 specimens ranged from 19 to 159 cm fork length. Gonadosomatic index peaked during spring and summer with main peak in June. Spontaneous spawning occurs around the year with peak in June. The overall female to male ratio was significantly 1 : 1.49 (P<0.05). Batch fecundity were estimated 1684954±118990 in 15 females. Relationship between total length and fecundity were calculated F=1.3717TL 2.9567 (r2= 0.82). Females reached 50% sexual maturity at 81.25 cm FL. Due to the spawning time of this fish, it is suggested to ban fishing in cobia in the spring season in order to manage the catch. On the other hand, considering that this fish is native, it can be considered as a good candidate for the reproduction industry and then breeding fish in cages.
کلیدواژهها [English]
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