Iwona Psuty-Lipska
Sea Fisheries Institute, Kołłątaja 1, 81-332 Gdynia, Poland

Key words: Vistula Lagoon, selectivity, gillnet fishery, pikeperch, perch, roach.

Abstract.
This paper addresses the problem of the impact of perch-roach gillnets on pikeperch resources in the Polish part of the Vistula Lagoon. The highest pikeperch by-catch was observed in May and June during the period when this species is protected. In subsequent months the catch efficiency of the perch-roach gillnets for pikeperch decreased. The flattened curve of the length distribution of the pikeperch caught in perch-roach gillnets indicates that the selectivity of this gear is low with regard to this species.