Interactions between temperature and size on the growth, size heterogeneity, mortality and cannibalism in cultured larvae and juveniles of the Asian catfish, Pangasianodon hypophthalmus (Sauvage)
Identifieur interne : 000467 ( Istex/Curation ); précédent : 000466; suivant : 000468Interactions between temperature and size on the growth, size heterogeneity, mortality and cannibalism in cultured larvae and juveniles of the Asian catfish, Pangasianodon hypophthalmus (Sauvage)
Auteurs : Etienne Baras [France] ; Thomas Raynaud [France] ; Jacques Slembrouck [France] ; Domenico Caruso [France] ; Christophe Cochet [France] ; Marc Legendre [France]Source :
- Aquaculture Research [ 1355-557X ] ; 2011-01.
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Abstract
Temperature effects vary throughout the ontogeny, but are proportionally more variable during the early life stages than in older fish. The larvae of a few species have been studied but contrasting trajectories were observed, thereby making it difficult to predict how temperature impacts on the growth, survival and size heterogeneity in a particular species. This study examined these interactions in young [0.9 mg–1 g wet mass (WM)] Pangasianodon hypophthalmus, one of the most extensively cultured tropical fish. Fish were raised at five temperatures from 23 to 33 °C in a recirculated water system, fed in excess with a high‐energy feed (Artemia then a formulated feed, >50% protein), and examined at 1‐day (first feeding days) or 4‐day intervals (older fish). The temperature that produced the fastest growth (T°opt) was 31 °C at the start of exogenous feeding (0.9 mg); it increased to 32.7 °C at 8 mg then decreased by 0.7 °C for each 10‐fold increase of WM. Size heterogeneity was lower and survival was higher (70–85% from 0.9 mg to 1 g) when the temperature was close to T°opt. Comparisons with other species suggest that the slope of the relationship between T°opt and fish size has a strong latitudinal component, and may also reflect the fish sensitivity to oxygen.
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DOI: 10.1111/j.1365-2109.2010.02619.x
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