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The decline of a roach Rutilus rutilus (L.) population in Chew Valley Lake
Author(s) -
Wilson R. S.
Publication year - 1971
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1111/j.1095-8649.1971.tb03655.x
Subject(s) - rutilus , biology , population , fishery , fish <actinopterygii> , trout , ecology , odonata , zoology , demography , sociology
A series of nettings for roach in Chew Valley Lake carried out by members of the Zoology Department, Bristol University, has revealed a marked decline in the population between 1965 and 1968. Fish from the main Lake were found to be heavily parasitized with Ligula intestinalis (L.) while those from the inflow pool (Herriott's Pool) were practically free from infection. It is considered that the decline of the roach can be linked to the incidence of Ligula , but that clean fish from the inflow pool may provide breeding stock and maintain the production of fry, which serve as food for the trout.