Evaluation of the Composition of Ichthyofauna in Lakes Free from Commercial Use in a Tightly Protected Area of the Wolin National Park (Poland)

The ichthyological biodiversity of Polish lakes is poorly understood, even in not used for fishing and those under strict protection. With this mind, the aim study was to conduct a comprehensive survey several Wolin National Park (Poland). conducted Domysławskie Gardno anthropogenic Stara Kredownia reservoir. Each exercise using benthic nets over 12 h period. fish caught were measured weighed, species identified. Shannon-Wiener (H) Simpson indices determined. catch comprised total 4580 (of which 4391 Lake) belonging 15 species, with combined weight 98,165 g. In general, most prevalent non-predatory fish: roach (Rutilus rutilus), freshwater bream (Abramis brama), white (Blicca bioerkna), bleak (Alburnus alburnus), rudd (Scardinius erythrophthalmus). Individually, perch (Perca fluviatilis) rutilus) abundant species. Ichthyofauna diversity varied greatly between studied water bodies, found Lake only 6 Lake. Reservoir, no caught, but amphibians observed, such as great crested newts (Triturus cristatus) common (Lissotriton vulgaris). Based on results obtained, had higher ichthyofauna than other ‘tench pike’ lakes. much lower biodiversity.