Seasonal changes in microhabitat selection by rainbow trout in a small stream

Transactions of the American Fisheries Society
By: , and 

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Abstract

Shifts in microhabitat selection by rainbow trout Oncorhynchus mykiss were related to seasonal and ontogenetic factors in a small stream characterized by short riffles, small pools, and boulder substrate. Resource availability did not differ significantly between summer and November sampling dates for most variables related to water velocity, substrate, and cover, although depths were greater and temperatures were significantly lower in November. Ontogenetic shifts were found for total depth, focal elevation, mean water column velocity, focal velocity, surface velocity, and substrate, but not for relative depth or temperature. When microhabitat selection was adjusted for fish size, selection was significantly different between seasons, most notably for velocity. Ontogenetic shifts in microhabitat use by young-of-year rainbow trout were interrupted by cooling winter temperatures. These changes resulted in substantially different microhabitat requirements for all rainbow trout size-classes in different seasons.

Publication type Article
Publication Subtype Journal Article
Title Seasonal changes in microhabitat selection by rainbow trout in a small stream
Series title Transactions of the American Fisheries Society
DOI 10.1577/1548-8659(1991)120%3C0166:SCIMSB%3E2.3.CO;2
Volume 120
Issue 2
Year Published 1991
Language English
Publisher Taylor & Francis
Contributing office(s) California Water Science Center
Description 11 p.
First page 166
Last page 176
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