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Growth, Reproduction and Condition of Roach ( Rutilus rutilus (L.)), Perch ( Perca fluviatilis , L.) and Ruffe ( Gymnocephalus cernuus (L.)) in Eutrophic Lake Aydat (France)
Author(s) -
Jamet JeanLouis,
Desmolles François
Publication year - 1994
Publication title -
internationale revue der gesamten hydrobiologie und hydrographie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.524
H-Index - 52
eISSN - 1522-2632
pISSN - 0020-9309
DOI - 10.1002/iroh.19940790216
Subject(s) - rutilus , perch , fecundity , biology , eutrophication , reproduction , fishery , ecology , fish <actinopterygii> , population , nutrient , demography , sociology
Abstract The growth, reproduction and condition of adults of the three dominant fish species (roach, Rutilus rutilus , (L.); perch, Perca fluviatilis , L. and ruffe, Gymnocephalus cernuus , (L.)) in the eutrophic Lake Aydat were studied over one year cycle. Compared to published data, the growth of R. rutilus and G. cernuus was about average, while that of P. fluviatilis was below average. Comparing to literature, the fecundity of R. rutilus and G. cernuus was low but their oocytes were large. In contrast, P. fluviatilis had a high fecundity but small oocytes. At the end of summer, an abrupt decrease in the condition was recorded only for perch, probably due to stress as a result of environmental conditions. The sex‐ratio was in favour of females for the three studied species but, in contrast to G. cernuus , the sex‐ratio of R. rutilus and P. fluviatilis increased significantly also with age. It is concluded that Lake Aydat is a more favourable environment for R. rutilus and G. cernuus than for P. fluviatilis .