Pakistan Journal of Biological Sciences1028-88801812-5735Asian Network for Scientific Information10.3923/pjbs.2000.623.626KutrupBilal 4200034In this study, the abundance of freshwater fish and relationship with certain ecological parameters of the Trabzon region were investigated. In addition, the migration ways of sea trout which is the marine form of Salmo trutta labrax were researched. When the sampling stations and number of the species are taken into consideration, Cyprinidae, known as white fish, are dominant especially at the middle and lower parts of streams. Salmo trutta labrax is dominant at the upper parts of the streams. In addition to Salmo trutta labrax, Barbus plebejus escherichi and Gohius eurycephalarges are often encountered at the upper parts of streams. Although Barbus plebajus escherichi has the highest number of individuals (20.50), Salmo trutta labrax has the highest %n (44.47) and % g (81.83) values. From twelve examined streams during this investigation, two sea trout specimens were only caught from Yanbolu and Sogutlu. All of the streams of this region are short and flow very rapidly. They relatively become smooth towards the sea. Haskoy station has the critical pH and O2 value due to domestic pollution. Except this station environmental parameters such as dissolved O2, pH and conductivity were found optimal for Salmo trutta labrax.]]>Berg, L.S., 1949Vol. 1-3,Elvira, B.,1987Chondrostoma agassiz, 1835 (Pisces, Cyprinidae).]]>11111140Koswing, C.,19541st Edn., Vol. 1, pp: 119pp: 119Kuru, M.,197136137147Kuru, M.,19711st Edn., Vol. 36,pp: 137-147pp: 137-147Kuru, M.,19751975Kuru, M.,19809103133Kuru, M.,1981Chondrostoma species of Turkey.]]>10111121Kutrup, B.,19931993Kux, Z. and H.M. Steiner,197256/57375384Ladiges, W.,196963101109Lelek, A.,1988Vol. 16,pp: 5-10pp: 5-10Slastenenko, E.,1956Pages: 711Pages: 711