The Length-weight relationships (LWRs) are very important to data for accurate estimate of populations in stock menagement. In this study, the length-weight relationships of some fish in Göynük stream, Murat River (Bingöl/Turkey) were examined. The LWRs and condition factor (K) of Cyprinon macrostomus, Gara rufa, Barbus lacerta, and Acanthobrama marmid were analyzed. LWRs was estimated using the linear regression model. LWRs were obtained as TW = 0.013L2.98, 0.057L2.40, 0.016L2.79 and 0.029L2.82 for C. macrostomus, G. rufa, B. lacerta and A.marmid, respectively. The b values acquired in the four fish species ranged from 2.13 (G. rufa-Male) to 3.34 (B. lacerta-Male). The K of the fish species varied from 0.90 (A. marmid-Male) to 1.27 (G. rufa-All), indicating that most of the fish were in good condition. However, C. macrostomus and G. rufa were better condition than B. lacerta and A. marmid. The study has provided baseline information on the LWR and K of the fish species in Göynük Stream. The datas that would be useful to adapt the adequate regulations for sustainable fish stock estimation in the stream for fishery biologist.

In this study, antioxidant enzyme activities (superoxide dismutase (SOD), catalase (CAT), glutathione peroxidase GPx), glutathione reductase (GR) and glucose 6-phosphate dehydrogenase (G6PD)) and malondialdehyde (MDA) levels occurring throughout the year were examined in Cyprinion macrostomus tissues (kidney, gill, liver and gonad) captured from Göynük Stream (Bingöl, Turkey). For this purpose, two locations (Ilıcalar and Garip) where fish can be caught regularly in summer, autumn, winter and spring were determined. Fish were caught regularly from these two locations every month and brought to the laboratory. Spectrophotometric methods were used to determine enzyme activities and MDA levels in the study. As a result of the study, it was determined that the MDA level and enzyme activities between Ilıcalar and Garip stations, in general, were statistically different from each other in all tissues. However, it was observed that there were important differences in general between the seasons at both stations. In addition, while GR and G6PD activities were lower than other enzyme activities throughout the study, CAT and SOD activities were higher.