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The feeding selectivity of silver carp, Hypophthalmichthys molitrix Val.
Author(s) -
Smith D. W.
Publication year - 1989
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.1095-8649.1989.tb03366.x
Subject(s) - silver carp , hypophthalmichthys , filtration (mathematics) , biology , particle size , particle (ecology) , carp , zoology , cyprinidae , fishery , fish <actinopterygii> , ecology , mathematics , statistics , paleontology
Effects of particle size, fish size and temperature on the filtration rate of silver carp were determined. When feeding at 20°C on zooplankton and spherical particles (yeast, micronic beads and pollen), 32‐g silver carp filter particles larger than 70 urn at a maximum rate of 18.251 h −1 . For particles smaller than 70 μm, filtration rates decrease with decreasing particle size until there is no measured filtration for particles smaller than 10 μm. Filtering rates ( FR ) for particles between 10 and 50 μm are described by the equation, FR =−20.8 + 21.7 × log particle diameter. Filtration rates rise as fish size, particle size and temperature increase. Filtration rates per unit biomass, however, fall as fish size increases: FR = 1.54 W 0.713 , where FR is the maximum filtration rate in 1 h 1 fish 1 and W is weight of fish in grammes. The results of these trials are consistent with the hypothesis that particle selection by silver carp is a mechanical, passive function of gill raker morphology.