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Paper Information

Journal:   JOURNAL OF VETERINARY RESEARCH   2000 , Volume 55 , Number 4; Page(s) 49 To 52.
 
Paper: 

COLD TOLERANCE IN TILAPIA: I-INTERSPECIFIC AND INTRASPECIFIC PHENOTYPIC VARIATION

 
 
Author(s):  AMINI F., BEARDMORE J.A.
 
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Abstract: 

Tilapia are native to Africa and their cold tolerance is a limiting factor for their aquaculture expansion in temperate areas including some parts of Iran. In this study, 207 individuals of Oreochromis niloticus, O. aureus and O. mossambicus were assayed for cold tolerance. The quantitative indicators of cold tolerance used were temperatures at which fish showed certain cold-induced behaviors including disequilibrium (TeD), Loss of equilibrium (TeL) and unconsciousness (TeU). There was intraspecific variation in each trait and phenotypic correlations were evident. Although the total variation within each of the three species was low (CV£57.3%) the relative variation was most in O. mossambicus. O. niloticus was detected as to be intermediate and O. aureus showed the least variation. The interspecific variation was very highly significant (P<0.001) and the rank of cold tolerance in the species under investigation was determined as follows: O. mossambicus<O. niloticus<O. aureus. Parameters such as sex, weight, length and body height did not significantly influence cold tolerance while age had a significant effect on the traits. The repeatability of the cold tolerance indicators were estimated as to be mediocre (r£0.45) based on two measurements in three tilapia species.

 
Keyword(s): TILAPIA, COLD TOLERANCE, PHENOTYPIC VARIATION, REPEATABILITY, AQUACULTURE
 
References: 
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