Effects of water temperature and fish size on growth and bioenergetics of cobia (Rachycentron canadum)

The effects of water temperature at 23, 27, 31, 33 and 35°C on growth and bioenergetics of cobia Rachycentron canadum with initial body weights about 10, 30, 70 and 200g were investigated in this paper. Food consumption, fecal production, nitrogenous excretion, growth rate and metabolic rate of cobi...

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Bibliographic Details
Published in:Aquaculture 2014-04, Vol.426-427, p.172-180
Main Authors: Sun, Lihua, Chen, Haoru
Format: Article
Language:English
Subjects:
Aquaculture
Bioenergetics
Cobia (Rachycentron canadum)
Fish
Fish size
Growth
Metabolism
Water temperature
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Summary:The effects of water temperature at 23, 27, 31, 33 and 35°C on growth and bioenergetics of cobia Rachycentron canadum with initial body weights about 10, 30, 70 and 200g were investigated in this paper. Food consumption, fecal production, nitrogenous excretion, growth rate and metabolic rate of cobia were affected significantly by both water temperature and fish size. However, the relationships between food energy and feces, excretion, growth and metabolism energy exhibited linear curves and seemed independent of water temperature and fish size in the present study. For each fish size growth increased with temperature up to 33°C and then declined at 35°C. The optimal temperature for growth (Topt.G) of 10–200g cobia was 33°C. For each water temperature growth was negatively correlated to fish size and the model, SGR=a+blnW or SGR=aWb, provided a good fit to the data obtained for 10–200g cobia. Food conversion efficiency (FCE) was highest at 31°C and lowest at 35°C for each size cobia. The optimal temperature for FCE (Topt.FCE) of 10–200g cobia was 31°C. An increasing trend of FCE with fish size was seen at each temperature and indicated that larger cobia had a superior capacity of food utilization. Energy budgets of cobia were also influenced significantly by water temperature and fish size. However, energy budgets were relatively constant over the 27-33°C temperature and 70-200 g size ranges for cobia. Over the whole temperature and size ranges the proportion of food energy lost in feces and excretion for cobia was small (
ISSN:0044-8486
1873-5622
DOI:10.1016/j.aquaculture.2014.02.001