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- W2104368754 abstract "Mortality of 0+ Eurasian perch was measured directly from the decline in catch in a high-speed plankton sampler and described by a negative exponential model. A mean mortality of 0.063 day 1 (range=0.020–0.089) was calculated; for 0+ juveniles it was 0.021 day 1. Mean larval production was 0.85–1.30 mg dry weight m−2 day−1 in Loch Kinord and 0.08–0.12 in Loch Davan. Annual production of 0+ juveniles was 1.97–7.55 kg wet weight ha −1 at L. Kinord and 1.01 kg at L. Davan. The contribution of 0+ perch, including the egg stages, to total perch production was 88–96%. Availability of food items on transition to exogenous feeding and through the larval period did not limit survival. Cannibalism by adults accounted for most of larval mortality, and predation by pike and adult perch were responsible for the majority of juvenile losses. The population structure of adult perch, for 12 year classes, was stable at L. Kinord, while year classes at L. Davan exhibited fluctuations in abundance and in two sampling years were eliminated in the first summer. Survival in the eleutheroembryonic phase was variable at L. Davan and observed to be low compared with L. Kinord. It is suggested that this was a result of water turbulence on the exposed and shallow spawning areas at L. Davan." @default.
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- W2104368754 date "1989-06-01" @default.
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- W2104368754 title "Mortality and production of 0+ perch, Perca fluviatilis L., in two Scottish lakes" @default.
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- W2104368754 doi "https://doi.org/10.1111/j.1095-8649.1989.tb03374.x" @default.
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