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The Impact of Squawfish on Salmonid Populations: A Review
Author(s) -
Brown Larry R.,
Moyle Peter B.
Publication year - 1981
Publication title -
north american journal of fisheries management
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.587
H-Index - 72
eISSN - 1548-8675
pISSN - 0275-5947
DOI - 10.1577/1548-8659(1981)1<104:tiosos>2.0.co;2
Subject(s) - predation , ecology , biology , trout , competition (biology) , oncorhynchus , ecosystem , fishery , fish <actinopterygii>
Examination of the available literature on the effects of squawfish (Ptychocheilus spp.) predation and competition on salmonid populations indicates that: (1) squawfish may prey extensively on young salmon in lakes, but there is little evidence that this predation has much impact on the number of returning adults; (2) squawfish do not appear to be significant predators of salmon and trout in streams except under highly localized, seasonal or unusual circumstances; and (3) there is little evidence to indicate that squawfish compete strongly with salmonids. Areas of research are suggested that would clarify the role of squawfish in regulating salmonid populations and elucidate their position in the aquatic ecosystems of western North America.