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Estimates of Fish Populations in Warmwater Streams by the Removal Method
Author(s) -
Johnson Murray G.
Publication year - 1965
Publication title -
transactions of the american fisheries society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.696
H-Index - 86
eISSN - 1548-8659
pISSN - 0002-8487
DOI - 10.1577/1548-8659(1965)94[350:eofpiw]2.0.co;2
Subject(s) - notropis , catostomus , streams , riffle , acre , minnow , standing crop , fishery , fish <actinopterygii> , biology , ecology , habitat , agronomy , computer network , biomass (ecology) , computer science
The removal method was used to estimate the size and composition of fish populations in four warmwater streams in southern Ontario. The assumptions underlying the removal method and variability in the data were examined. Populations of 8 to 33 thousand fish per acre weighing 32 to 174 pounds per acre were estimated. Four of 22 species of fish encountered comprised two‐thirds of the average standing crop of 120 pounds per acre. These four, the white sucker, Catostomus commersoni, blacknose dace, Rhinichthys atratulus, creek chub, Semotilus atromaculatus, and common shiner, Notropis cornutus, appeared to be the best able of all species to utilize both pools and riffles. Other species were associated with either pools or riffles and, therefore, while locally abundant, had lower average standing crops in the characteristic pool‐riffle habitat of the streams studied.