THE FEEDING SELECTIVITY OF WELS (SILURUS GLANIS L.) IN LAKE GÓRECKIE
Maciej Czarnecki, Wojciech Andrzejewski, Jerzy Mastyński
Department of Inland Fishery and Aquaculture,
August Cieszkowski Agricultural University of Poznań, Poland
ABSTRACT. In 1997, 375 cultivated wels specimens were released into Lake Góreckie, which is located in the Wielkopolski National Park. The average mass per specimen was 1,350 g. Control catches were made in 1998 and 1999, and the diet consumed by the wels was investigated. The striped crayfish Orconectes limosus Raf. was detected in 51% of the fish caught. The contribution of striped crayfish to the wels diet fell to 4% after two years. This was probably correlated with changes in the feeding grounds of the older wels.
Key words: WELS (SILURUS GLANIS), STRIPED CRAYFISH (ORCONECTES LIMOSUS), FOOD SOURCE
Maciej Czarnecki, Akademia Rolnicza im. Augusta Cieszkowskiego w Poznaniu, Katedra Rybactwa Śródlądowego i Akwakultury, ul. Wojska Polskiego 71C, 60-625 Poznań; Tel./Fax: +48 (61) 8487706, e-mail:firstname.lastname@example.org