بررسى مقايسه ا ى نسبت جنسى شاخص هاى GSI و HSI بين دو جنس نر و ماده ماهى طلال ( Rastrelliger kanagurta ) در سواحل جنوبى ايران

Comprative study sex ratio, GSI, HIS Between the two female and male genus talal fish in Iranʹs southern coast

Talal fish with generic name "Rastrelliger kanagurtaʹʹ is one of the bony fishes and also the valuable species in the entire world. Since no studying hadnʹt been carried out on this fish in iran, in framework of above study, in Iran southern Coasts, done biomet-ric studies and compare the two sexes. In the annual cycle from (Tir 87- Khordad 88) In each month, 50 fishes Randomly collected from Persian gulf and oman sea, after separation female and male, compare GSI, HIS and also ferequency of different longitudinal classes in two genus with together. GSI peak in talal fish from (Tir87 - khordad88) in both genus is in the ordibehesht. that indicates spawning season in spring. HSI peak also in female genus is in the ordibehesht, that indicates spawning and vitellogenesis coincide. But HSI peak in male is in the dey. it is a significant relation between total length mean offish in the female and male group. Meantimp the first 6 month of project males were more from females and counter were in the second 6 month.