Article (Scientific journals)
Ontogenetic variations of thermal optimum for growth, and its implication on thermolabile sex determination in blue tilapia
Baras, E.; Mpo'n'tcha, A.; Driouch, H. et al.
2002In Journal of Fish Biology, 61 (3), p. 645-660
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Keywords :
sex determination; temperature; evolution; survival; Oreochromis; Cichlidae
Abstract :
[en] Knowledge of how the optimum temperature for growth (Tdegrees(opt)) varies during ontogeny, and how close it is to the temperatures that induce Phenotypic masculinization is fundamental to the understanding of the evolution of thermolabile sex determinism (TSD) in fishes. In blue tilapia Oreochromis aureus, Tdegrees(opt) is 32.6degrees C at the start of exogenous feeding (10 mg fish) and it decreases by c 1degrees C each time that the fish bode mass increases by an order of magnitude. Temperatures <35degrees C are not sufficient to induce complete phenotypic masculinization. Based on a multiple-regression model (r(2)=0.938) plotting growth against body mass and water temperature. genotypically female tilapia living at high temperatures during the thermosensitive period (21-28 days) and being reversed into phenotypic males should incur an initial growth disadvantage over fish living at Tdegrees(opt) but not over those living at slightly colder temperatures (27-29degrees C). This initial disadvantage would be later compensated for by faster growth because of between-sex growth dimorphism to the detriment of phenotypic females. These arguments suggest that there is no definite pressure against the selection of TSD in blue tilapia and probable other Oreochromis spp. (C) 2002 The Fisheries Society of the British Isles. Published by Elsevier Science Ltd. All rights reserved.
Disciplines :
Aquatic sciences & oceanology
Author, co-author :
Baras, E.
Mpo'n'tcha, A.
Driouch, H.
Prignon, Christian ;  Université de Liège - ULiège > Centre de formation et de recherche en aquaculture (CEFRA)
Mélard, Charles ;  Université de Liège - ULiège > Centre de formation et de recherche en aquaculture (CEFRA)
Language :
English
Title :
Ontogenetic variations of thermal optimum for growth, and its implication on thermolabile sex determination in blue tilapia
Publication date :
September 2002
Journal title :
Journal of Fish Biology
ISSN :
0022-1112
eISSN :
1095-8649
Publisher :
Academic Press Ltd Elsevier Science Ltd, London, United Kingdom
Volume :
61
Issue :
3
Pages :
645-660
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 03 December 2010

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