Fecundity Estimation of Sobur Tenualosa ilisha (Ham.Buch.1822) in Khuozestan Province's Rivers

• Main Author: J. Ghaflemarammazi; M. Almokhtar; Gh. Eskandari
• Format: Article
• Language: fas
• Published: Iranian Fisheries Research Organization 1998-01-01
• Series: ‬‭Majallah-i ̒Ilmī-i Shīlāt-i Īrān
• Subjects: age; between; fishes
• Online Access: http://isfj.areo.ir/article_116345_en.html

Sixtyfive units of sobur (Tenualosa ilisha) with ripe ovaries were examined at 15 allocated stations. The length of fishes ranged from 328 to 500 mm and were caught by drifting gill nets (in few cases by fixed gill nets) in Khuozestan's waters (coastal area, Bahmanshir, Arvand, Karoon and Dez rivers). Ovaries were preserved and transferred to the lab taking the available standard methods into account before estimating the fecundity. The lowest and the highest absolute fecundity were 374892 and 1954144 in samples with total lenght of 380 and 500 mm respectively. Minimum relative fecundity was 514 and the maximum was 1649 in fishes with 430 and 328 mm of length respectively. Minimum and maximum relative somatic fecundity were 581 and 1836 observed in fishes with total length of 430 and 328 mm respectively. The highest correlation was observed between absolute fecundity and girth, but the lowest negative correlation was observed between relative fecundity and length. Correlation between fecundity and several biological characters was studied and the highest multiple regression was observed between fecundity and gonad weight, GSI, ovadiameter and age.