The paper presents the results of studies on meristic and biometric parameters in spined loach, Cobitis taenia (L.) from Zegrzyński Dam Reservoir. Body proportions were determined as well as the relations between the parameters under study and body and head length. Statistically significant differences were found in the values of some biometric parameters m males and females. The results were compared with the ĺata from the lit- erature of spined loach populations in which the species Cobitis taenia was well defined.
The paper presents the results of studies on spined loach, Cobitis taenia (L.) diet in Zegrzyński Dam Reservoir. Food composition of the fish collected at four stations was analysed and compared. The stations differed as to the environmental conditions. Changes of diet components in particular months were described for two sampling stations, habitat conditions preferred by spined loach were described on the basis of the results and the literature data. A description was also given of its feeding grounds in the reservoir, and of the food of this fish in different places of its range of occurrence.