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Age, growth and length‐weight relationship of brown trout Salmo trutta (L.) in the Loch of Strathbeg, Aberdeenshire
Author(s) -
Treasurer James W.
Publication year - 1976
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.1095-8649.1976.tb03948.x
Subject(s) - salmo , brown trout , biology , trout , fishery , population , fish <actinopterygii> , range (aeronautics) , ecology , demography , materials science , sociology , composite material
Most age and growth studies on brown trout in British lakes have been restricted to highland or moorland areas. In the unusual environment of a coastal dune lake (Loch of Strath‐beg, Aberdeenshire) the trout population was short‐lived with few fish surviving longer than three years. Growth was rapid compared with other naturally‐stocked lakes. Growth in length and weight differed between 1–and 2–migrants. Faster growth in the burn was the factor causing early migration by 1–migrants (71% of population), but both groups grew at the same rate on entering the loch. The effect of gill‐net selection on the estimation of the length‐weight relationship was demonstrated. A small difference was found in the length‐weight relationship among the mature stages. Factors responsible for rapid growth and small age‐range of the population are discussed.