brown trout, salmo trutta fario, has a wide range of distribution in the north of iran and in karaj, lighvanchai and karun rivers, but there is no report about its feeding behavior in some water resources including the lar natural park. in order to study feeding behavior of this fish during spawning season, a survey was carried out in the rivers of elarm, aab-sefid, kamardasht and delichayi in ...

the aim of this investigation was to study macroscopic and microscopic structures of ovaries in barbus grypus of karoon river and their changes during annual maturation cycle. for this purpose, 120 adult  b.grypus with a mean weight of 835.0 to 1012.0 g, were caught from karoon river and transferred alive to the laboratory. after biometrical studies, the weights and morphological appearances of...

The spawning season of the milkfish Chanos chanos (Forsskål, 1775) family Chanidae in Central Coast Vietnam was determined. A total 220 specimens (3.20 to 4.50 g body weight, BW) collected from seven provinces (Nghe An, Ha Tinh, Quang Binh, Tri, Binh Dinh, Khanh Hoa, Ninh Thuan) January December 2021. Results showed that Gonado Somatic Index (GSI) ranged 2.03 16.02 females and 1.15 9.87 males h...

Reproductive morphometry of Clarias gariepinus (C. gariepinus) is essential in distinguishing different species that are closely related to it and adequate information required regarding the seasonal variation milt characteristic wild species. This study was designed document reproductive tract morphometric dimensions characteristics C. during spawning non-spawning seasons Lake Alau, Maiduguri,...

The out-of season induced spawning of the Cyprinus carpio was done during period October 2009 to February 2010 (Autumn and Winter), in hatchery Marin Science Center. brooders average weight 1.700-4.000 kg for females 1.500-1.800 males. were acclimated on 22 °C, a 10 days. photoperiod 12-14 hour/day. results showed that this regime only one female 3males had positive reaction pituitary gland hor...