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Influence of Genotype and Temperature on the Relationship between Specific Growth Rate and Size of Rainbow Trout
Author(s) -
Wangila B. C. C.,
Dick T. A.
Publication year - 1988
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(1988)117<0560:iogato>2.3.co;2
Subject(s) - rainbow trout , salmo , fish <actinopterygii> , biology , zoology , genotype , growth rate , covariance , regression analysis , linear regression , fishery , ecology , statistics , mathematics , genetics , gene , geometry
The relationship between specific growth rate and fish size (weight) was influenced by temperature and genotype in two strains of rainbow trout Oncorhyncus mykiss (formerly Salmo gairdneri ) and their hybrid. Heterogeneity among the regression slopes for strains (genotype) as well as interaction with temperature invalidated the use of analysis of covariance to adjust for initial fish size differences. Regression slopes ranged from –0.74 ± 0.21 (SE) to –0.01 ± 0.16 among fish families reared at 7°C and from –0.41 ± 0.03 to –0.24 ± 0.09 among fish families reared at 15°C. The use of a particular slope value as a universal constant to compare specific growth rates offish is questionable.