Temperature and dissolved oxygen influence growth and digestive enzyme activities of yellowtail kingfish Seriola lalandi (Valenciennes, 1833) |
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| Authors: | Jenna N Bowyer Mark A Booth Jian G Qin Trent D'Antignana Michael J S Thomson David A J Stone |
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| Institution: | 1. School of Biological Sciences, Flinders University, , Adelaide, SA, Australia;2. NSW Department of Primary Industries, Port Stephens Fisheries Institute, , Nelson Bay, NSW, Australia;3. Clean Seas Tuna, , Port Lincoln, SA, Australia;4. South Australian Research and Development Institute, Aquatic Sciences Centre, , West Beach, SA, Australia |
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| Abstract: | A 5 week experiment was carried out with juvenile yellowtail kingfish Seriola lalandi to investigate the interactive effects of water temperature (21, 24, or 27°C) and dissolved oxygen regime (normoxic vs. hypoxic) on the growth rate, feed intake and digestive enzyme activity of this species. Specific growth rate (SGR) was highest at 24°C, regardless of oxygen regime, but the SGRs of the fish exposed to hypoxia at 21, 24 and 27°C were 13%, 20% and 17% lower, respectively, than the SGRs recorded for the fish reared under normoxic conditions. The digestive enzyme activities (i.e. trypsin, lipase and α‐amylase) were influenced by temperature but did not appear to be affected by dissolved oxygen concentration. Information about the effects of water temperature and dissolved oxygen on feeding, growth and digestive capacity of juvenile yellowtail kingfish could contribute to improving feed management decisions for production of this fish species under different environmental conditions. |
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| Keywords: | Carangidae digestive enzymes growth optimal temperature hypoxia normoxia |
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