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Cyclic feeding and subsequent compensatory growth do not significantly impact standard metabolic rate or critical swimming speed in rainbow trout
Author(s) -
Blake R. W.,
Chan K. H. S.
Publication year - 2006
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1111/j.1095-8649.2006.01152.x
Subject(s) - rainbow trout , biology , zoology , fish <actinopterygii> , significant difference , fish measurement , metabolic rate , medicine , endocrinology , fishery
Standard metabolic rate ( R s ) and critical swimming speed ( U crit ) were used to assess the aspects of physiological status (stamina) of rainbow trout Oncorhynchus mykiss . Fish were fed either 1·5% body mass daily, 1·5% body mass cyclically (3 weeks of food deprivation followed by 3 weeks of refeeding), a ration based on Stauffer’s formula (a maximum temperature‐specific ration level) daily or on Stauffer’s ration cyclically for 18 weeks. It was hypothesized that if cyclic feeding had no impact on the status of the fish, R s and U crit would not cycle with the feeding regime. This hypothesis was supported. No significant difference was found between the mean mass and the fork length of the four groups at the end of the experiment ( P > 0·05). Feeding had no effect on changes in R s among the four groups, which were significantly different throughout the experiment ( P ≤ 0·05). No significant difference in U crit was found ( P > 0·05) until at week 12 between groups fed 1·5% body mass ration cyclically and Stauffer’s ration daily ( P ≤ 0·05). For groups fed a 1·5% body mass ration cyclically and daily, significant differences occurred at week 15 ( P ≤ 0·05) but no significant difference was found by week 18 ( P > 0·05), suggesting that cyclic feeding does not affect the aspects of physiological status (stamina) of the fish.