This study involves the investigation of Tinca tinca (L., 1758) living in Kapulukaya Reservoir in Turkey. It was observed that the fish reach sexual maturity at the age of III and the breeding period starts in May and ends in July. The mean monthly gonadosomatic indices varied from 1.38 ±0.06 (in October) to 8.01±1.03 (in May). According to monthly variations of the GSI, spawning of the tench...

The ability of a certain genotype to express different phenotypes depending on variations in the environment is called phenotypic plasticity. Predator induced defences are among the most studied and wide spread examples of phenotypic plasticity. For example, in freshwaters, predators are constantly shaping communities with their presence and a plethora of defensive adaptations in prey have evol...

Flavobacterium psychrophilum, a member of the family Flavobacteriaceae, has from the first descriptions in North America, been distributed to many countries worldwide causing serious losses to the aquaculture industry. The Norwegian and Chilean aquacultures are also affected by outbreaks due to F. psychrophilum. The bacterium has been one of the most common causes of mortality in fresh water aq...

Since the arrival of invasive quagga mussels Dreissena rostriformis bugensis in Lake Constance, significant changes zooplankton and benthic invertebrate community were observed. Five years later mussel has become dominating species community. Its effects on other components food web, especially those at higher trophic levels such as fish, remain unclear around world. To evaluate actual impact q...