Bulletin of the Sea Fisheries Institute, Gdynia, 3. p. 33-46
Abstract:
The chemical body composition of roach (Rutilus rutilus L.) from four areas of the
Odra River estuary was investigated based on a sample of 132 fishes. Growth rate was analysed
using a sample of 738 individuals. Larger fish were prone to more intense fat accumulation.
Fat content increased as the growing season progressed, especially in the fish inhabiting coastal
Baltic waters and the eutrophic Lake D¹bie. Dry matter content exhibited a similar tendency.
The protein content did not change essentially, and although it did not depend on fish size in
the post-spawning period, it increased slightly with fish size in autumn. Ash content was not
correlated with fish size. The fastest length growth rate was observed in fish from the Pomeranian
Bay, while the slowest occurred in roach inhabiting Miêdzyodrze.
