Effects of short term acclimation in cool and warm water and influent water temperatures on temperature selection behavior in juvenile steelhead trout, Oncorhynchus mykiss

摘要: Abstract In September 2013, hatchery reared sub-yearling steelhead trout, Oncorhynchus mykiss, juveniles were separated into three groups and in 3 different water temperature regimes (ambient (14.4–16.9 °C), cool (10.6–11.8 °C), warm (20.0–22.3 °C)) circular tanks for approximately 1.5 weeks. Experiment 1, an individual trout juvenile acclimated ambient was transferred a two-choice stream tank where the fish received either (n = 12) or (n = 6)/warm (n = 6) water. During 30 min observation, clearly avoided both areas. 2, we juvenile, which cooled water, introduced (relative increase) (n = 6). Such increase caused to stay suggesting that once have 1.5 weeks, these would avoid relatively higher (ambient) cooler area. 3, warmed decrease) As result, relative decrease did not influence swimming location choice of juveniles, do (relatively water) even after they Based on findings, suggest changes may promote depending changing patterns.