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Production and food consumption of perch perca fluviatilis in 2 swedish forest lakes



Production and food consumption of perch perca fluviatilis in 2 swedish forest lakes



Institute of Freshwater Research Drottningholm Report (58): 140-157



The production and food consumption of perch (P. fluviatilis L.) were studied in 2 small (2.9 and 9.7 ha, respectively) forest lakes in Sweden. The lakes investigated are oligotrophic, with rather acid and brownish water. The fish population in Lake Vitalampa consists only of perch; Lake Botjarn also includes occasional pike (Esox lucius L.) During the 5 yr 1970-1974, production was 0.7-1.2 g/m2 yr and 1.3-2.7 g/m2. yr (wet weight) for Lakes Vitalampa and Lake Botjarn, respectively. The highest production values were as a rule recorded for the years when the newly-hatched fry were particularly numerous. In Lake Vitalampa, the production of the older fish (> 2+) was calculated to consist of approximately 50% sexual products. The annual food consumption was calculated with the aid of respiration experiments, under the assumption that 80% of the food consumed could be assimilated. The food consumption of the perch population during 1974 was 320 kg/ha in Lake Botjarn, and 136 kg/ha in Lake Vitalampa (wet weight). Of this amount 75% was consumed during the growth season (approximately 4 mo.). The predation on bottom fauna in Lake Vitalampa was very intensive, while the perch in that lake were only able to utilize to a very small extent the large zooplankton production.

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