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Prey selection by young trout fry ( Salmo trutta )
Author(s) -
Fahy Edward
Publication year - 1980
Publication title -
journal of zoology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.915
H-Index - 96
eISSN - 1469-7998
pISSN - 0952-8369
DOI - 10.1111/j.1469-7998.1980.tb01420.x
Subject(s) - predation , biology , salmo , plankton , benthos , brown trout , competition (biology) , trout , fauna , invertebrate , fishery , zooplankton , selection (genetic algorithm) , ecology , fish <actinopterygii> , salmonidae , zoology , benthic zone , artificial intelligence , computer science
Factors influencing the choice of invertebrate food by early feeding trout are sought, special attention being given to the dimensions of the prey. The stomach contents of fish of similar age feeding on lake plankton and drifting stream fauna are compared. Little consistent preference was displayed for the smaller planktonic organisms but prey size was of importance in the distribution of stream benthos among predators of different lengths. The width of the prey was of greater significance to selection than the mean volume or the area of the largest surface of the food items. When the fish were in obvious competition for food the correlation between predator length and all prey dimensions improved.