| Scientific papers | ||
| AGNIESZKA SZKUDLAREK-PAWE�CZYK - Early developmental stages of pikeperch in the Szczecin Lagoon: selected aspects of their biology and ecology from 1994 to 1998 | 3 | |
| TOMASZ WANDZEL - The food and feeding of the round goby (Neogobius melanostomus Pallas, 1811) from the Puck Bay and the Gulf of Gdańsk | 23 | |
| JADWIGA WIERZBICKA and EWA SOBECKA - Hysterothylacium incurvum (Rudolphi, 1819) (Nematoda: Anisakidae) - a parasite of swordfish (Xiphias gladius L.) | 41 | |
| Short communications | ||
| Maria Helena Cavaco and Gra�a Cabe�adas - Primary productivity off western and southern Portuguese waters | 49 | |
| WŁODZIMIERZ GRYGIEL and ALFRED GRELOWSKI - Hydrological conditions of the southern Baltic waters in autumn 2002 and spring 2003 | 61 | |
| Varia | ||
| IZABELA JAB�O�SKA-BARNA and ALEKSANDER BIELECKI - Piscicola pojmanskae Bielecki 1994 (Piscicolidae, Hirudinea) reported in a new location in central Pomerania | 77 |