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An experimental study on the compensatory growth of tongue sole, C ynoglossus semilaevis (Günther, 1873), following lower temperature manipulation
Author(s) -
Fang Jinghui,
Tian Xiangli,
Dong Shuanglin,
Fang Jianguang,
Zhang Jihong
Publication year - 2014
Publication title -
aquaculture research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.646
H-Index - 89
eISSN - 1365-2109
pISSN - 1355-557X
DOI - 10.1111/are.12101
Subject(s) - biology , juvenile , compensatory growth (organ) , zoology , fish <actinopterygii> , tongue , fishery , ecology , endocrinology , linguistics , philosophy , kidney
The compensatory growth, body composition and energy budget of juvenile tongue sole, C ynoglossus semilaevis (Günther, 1873), subjected to an unfavourable temperature were investigated during 56 days experiment. Fish were divided into four groups including three groups, which were reared at 16°C for 1, 2 and 3 weeks, respectively, then returned to 22°C (recorded as A1, A2 and A3) and a control group (continuously reared at 22°C, C). At the end of the experiment, the body mass was significantly higher in A1 than that in the control ( P < 0.05), which indicated over compensatory growth occurred in A1 fish. No significant difference was found in body mass among A2, A3 and C fish ( P > 0.05), which indicated complete compensatory growth occurred in A2 and A3 fish. The underlying mechanisms for compensatory growth could be attributed to an improved energetic efficiency resulting from reduced metabolic expenditure and higher feed efficiency during the period of recovery. Furthermore, the fish exposed to lower temperature for 3 weeks showed hyperphagia. The results suggested that the juvenile C . semilaevis exposed to lower temperature for a suitable period (1–3 weeks) used feed more efficiently. This approach may be a useful rearing strategy for indoor culture of C . semilaevis .