Effects of short-term administration of corticosterone and cortisol on plasma levels of thyroid hormones, gonado-somatic index and testicular histology have been reported in catfish, Clarias gariepinus during different phases of its breeding cycle. Corticosterone administration had no significant effect on plasma levels of T4, T3 and T3/T4 ratio, irrespective of doses and phases of breeding cyc...

Life history plasticity can be a strong predictor of the establishment and invasion success introduced fishes. Here, life-history traits four P. parva populations in adjacent ponds Southern England were measured throughout 2013 to determine timing length their reproductive season extent trait plasticity. The relative abundance (as catch per unit effort) was similar, with low variability relatin...

Some aspects of reproductive biology Gattan Barbus xanthopterus females were studied from 15-30 March, 2009. These fishes coughed Huweiza Marsh, Southern Iraq and Therthar Reservoir, Western Iraq, used for artificial breeding in Marine Science Center Hatchery. Total lengths ranged between 550-806 mm, total weights 3100-7250 g, their age 3-6 years. It had been found that all examined ovaries rip...

The fecundity and sexual structure of weatherfish (Misgurnus fossilis) population, an inperilled protected freshwater fish with a poorly known life history, was studied in three waterbodies: the River Ner, Południowy canal Nowy Rów (Poland) differing hydrological character. We compared reproductive traits; i.e. sex ratio, absolute relative fecundity, oocyte size, gonado-somatic index body condi...