Bulletin of the Sea Fisheries Institute 2 (159) 2003

Scientific papers   
WŁODZIMIERZ Grygiel and Mirosław Wyszyński - Temporal (1980-2001) and geographic variation in the sexual maturity at age and length of herring and sprat inhabiting the southern Baltic 3
Jan Horbowy, Magdalena Podolska and Krzysztof Radtke - The distribution, stock size and year-class strength of cod in the southern Baltic in 1981-2001 based on Polish groundfish surveys 35
Dorota Napierska and Magdalena Podolska - Preliminary results of AChE and GST measurements in flounder Platichthys flesus from the southern Baltic Sea 51
Alexei M. Tokranov and Alexei M. Orlov - On the distribution and biology of roughscale sole Clidoderma asperrimum (Temminck et Schlegel, 1846) in the Pacific waters off the northern Kuril Islands and southeastern Kamchatka 67
Short communications
Iwona Psuty-Lipska - Preliminary results regarding the impact of perch-roach gillnets on pikeperch resources in the Vistula Lagoon 81
Jacek Kosza�ka and Aleksander Bielecki - A new record of Piscicola borowieci Bielecki, 1997 (Hirudinea, Piscicolidae) in Poland 91