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The effects of temperature and different food organisms on the rate of gastric evacuation in perch ( Perca fluviatilis )
Author(s) -
PERSSON LENNART
Publication year - 1979
Publication title -
freshwater biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.297
H-Index - 156
eISSN - 1365-2427
pISSN - 0046-5070
DOI - 10.1111/j.1365-2427.1979.tb01493.x
Subject(s) - perch , gammarus pulex , biology , fish <actinopterygii> , zooplankton , range (aeronautics) , ecology , gammarus , fishery , zoology , crustacean , amphipoda , materials science , composite material
SUMMARY. The rate of gastric evacuation in perch Perca fluviatilis was studied at different mean temperatures (range 4.0–21.7°C). Gastric evacuation rates were empirically described by an exponential function and the relationship between the instantaneous evacuation rate ( R ) and temperature was also exponential. Evacuation rates were not significantly different ( P > 0.1) for the following food organisms: Gammarus pulex, Chaoborus , chironomids and zooplankton. The effects of temperature, different food organisms and fish size on the evacuation rates in different fish species are discussed.