Influence of Thermal Challenge on Conditioned Feeding Forays of Juvenile Rainbow Trout
作者:
B.H. Munson,
J.H. McCormick,
H.L. Collins,
期刊:
Transactions of the American Fisheries Society
(Taylor Available online 1980)
卷期:
Volume 109,
issue 1
页码: 116-121
ISSN:0002-8487
年代: 1980
DOI:10.1577/1548-8659(1980)109<116:IOTCOC>2.0.CO;2
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Juvenile rainbow trout (Salmo gairdneri) conditioned to traverse a 2.4-m-long channel to receive a food reward were subjected to in-transit thermal challenges. Conditioning was to a criterion that required 80% of the fish to leave the “home” area and reach the “reward” area within 2 minutes of release. Challenges were at successive 3 C increments above acclimation or the previous challenge temperature. Fish were first observed to delay their entrance into the intervening heated water at challenge temperatures of 12–15 C above acclimation. At each increment above 12–15 C over acclimation temperature, delay in transit increased; however, complete group inhibition was never achieved. Above their critical thermal maximum (CTM) the reward was achieved even at the expense of deaths among the achievers. Responses were the same whether fish were challenged individually or as groups. Fish exposed to their CTM without prior challenges at less stressful temperatures responded similarly to those receiving progressively greater challenges.
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