The fishery of bony fishes has an economic important in southern part of Caspian Sea ,but there are few reports about the pathogens of them in this area .Eustrongylides excisus , a parasite (Nematoda: Dioctophymidae) can damage the muscles of bony fishes . So, consumers avoid to buy the infected fish. Hence , the parasite can cause economic loss.In order to determine the occurance and intensity...

С целью изучения микрофлоры леща оз. Виштынецкого, исследованием которого
 ранее никто не занимался, произведен микробиологический анализ его кожи, жабр и
 внутренних органов. Обнаружено доминирование в бактериоценозе Виштынецкого
 бактерий рода Bacillus. Результаты наших исследований были сравнены с данными по
 микрофлоре Куршского залива, полученными сотрудником АтлантНИРО...

The distribution and reproductive success of fish were examined in Dutch soft waters of varying pH. In total, 20 fish species were encoun­ tered. The lowest pH-values at which fish species were observed varied remarkably. Umbra pygmaea and Tinea tinea appeared to be extremely acid tolerant and occurred in waters with pH-values below 4.0. Abramis brarna, Cyprinus carpio, E’sox iucius, Misgumus f...