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Nase Chondrostoma nasus L. is one of the most threatened reophilic fish species in Poland. At present it has almost disappeared from the northern and central parts of its range while in the south its abundance has decreased. Protection of the species through closed seasons, catch and size limits has not been sufficient, and active enhancement through stocking is now applied. Developing the technology of hormonally induced spaw...
Vertical distribution of planktivorous 0+ pikeperch, Stizostedion lucioperca (L.), in relation to particulate or filter feedingNARA Subscribed
The main prey of 0+ pikeperch in the pelagic zone of the Sulejow Reservoir was Leptodora kindtii and copepods, which together constituted only about 20% of the zooplankton by number in the water. Leptodora kindtii predominated in pikeperch food close to the surface, and copepods in deeper water. A depth‐dependent shift in feeding mode from large particle selection to filtering, as an adaptation to reduce intraspecific competit...
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