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Growth of juvenile halibut, Hippoglossus hippoglossus (L.), under a constant and switched temperature regime
Author(s) -
Aune A,
Imsland A K,
Pittman K
Publication year - 1997
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 - 10.1046/j.1365-2109.1997.00924.x
Subject(s) - halibut , hippoglossus hippoglossus , biology , juvenile , zoology , fish <actinopterygii> , growth rate , fishery , ecology , mathematics , geometry
The effect of thermal history (11°C and 14°C) on growth of juvenile halibut, Hippoglossus hippoglossus (L.) (initial mean weight 140 g, n = 254), was studied. Fish were divided into four groups, two groups remaining at constant temperature (C11, Cl4), and fish in the other groups being transferred from either 11°C to 14°C (F11:14) or from 14°C to 11°C (F14:11). Twenty fish in each tank were tagged (PIT) at the start of the experiment. The final mean weights were significantly higher in F14:11 (384 g) than in F11:14 (308 g) and C14 (317 g). Further, F14:11 had significantly higher length growth rate ( SLGR ) than both F11:14 and C14. No significant differences between the experimental groups within each temperature (F14.11 vs. C11, and F11:14 vs. C14) were, however, found. Growth rate ( SGR ) declined rapidly with increasing size (from 1.4–1.8% day −1 to 0.4–0.8% day −1 ). It is concluded that the optimal temperature for growth of juvenile halibut declines with increasing size. Thus, as halibut grow larger, the temperature should be reduced to take advantage of this change in optimal temperature for growth.