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- W2124018506 abstract "The effects of intensive fishing and fish recruitment on the nutrient excretion rate by a planktivorous roach Rutilus rutilus stock in Lake Vesijärvi were estimated using a bioenergetics model. The values were compared with those given by the model assuming that no mass removal occurred or that the mass removal ceased after 2 years. According to the model, during June‐August 1989 phosphorus (P) excretion by the pelagic roach stock corresponded to 18% of the annual external P loading and showed a maximum of 0.4 mg m −2 day −1 . As a result of mass removal, the maximum daily P excretion declined to 0.18 mg m −2 by 1990 and to 0.10 mg m −2 by 1992. The reduction was due to the lower number of roach, while the excretion rates of individual fish were unaffected. A 2‐year mass removal would have temporarily reduced the P excretion rate, but in 1991 and 1992 the highest daily excretion rates would have been doubled compared with values after the 4‐year mass removal. Assuming no fishing mortality, interannual differences were diminished and the excretion rates in 1991 and 1992 were 2.5 times higher than the values after the 4‐year mass removal. The results suggest that nutrient recycling by fish stocks may be affected substantially by fisheries management. However, the effects are dependent on the timing of fishing due to the variations in the year class strength of fish. In Lake Vesijärvi the reduction in nutrient excretion was amplified coincidentally by the natural variation in recruitment of the roach stock." @default.
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- W2124018506 date "1998-05-01" @default.
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- W2124018506 title "Effects of mass removal and variable recruitment on nutrient excretion by a planktivorous roach stock" @default.
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- W2124018506 doi "https://doi.org/10.1111/j.1095-8649.1998.tb00595.x" @default.
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