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Juvenile European pikeperch, Sander lucioperca, were fed commercial feed (group C) or experimental feed supplemented with NuPro® nucleotide‐rich Saccharomyces cerevisiae yeast protein (extract obtained through a cell wall removal process) in doses of 20, 40 or 60 g kg−1 feed (groups N2, N4, N6) for 8 weeks. Growth, non‐specific immunity parameters, histological structure of the liver and intestine,...
The anatomical structure of gonads in coregonids is characteristic for teleost fishes with follicular, synchronous group tape-like ovaries and acinose type, lobulated testes. In some alpine lakes in Switzerland and in water bodies in northern Poland, certain disorders and changes in the macroscopic structure of whitefish Coregonus sp. gonads have been observed in the pre-spawning period. In males,...
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