Effects of water temperature on protein synthesis and protein growth in juvenile Atlantic wolffish (Anarhichas lupus)
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The effects of water temperature (5, 8, 11, and 14°C) on the fractional rate (percent per day) of protein consumption (kr) and on white muscle and whole-body fractional rates of protein synthesis (ks), protein growth (kg), and growth efficiency (PPV, growth/consumption; kg/ks, growth/synthesis) of juvenile Atlantic wolffish (Anarhichas lupus) (initial body weight 26 g) were studied. Rates of protein consumption and white muscle and whole-body protein synthesis increased in a linear fashion between 5 and 14°C. In contrast, the relationships between temperature and white muscle and whole-body protein growth, protein growth efficiency (PPV) and protein synthesis retention efficiency (kg/ks) were parabolic. The results indicated that the optimum water temperatures for growth (Topt.G) and growth efficiency (Topt.GE) were 10–11 and 9–10°C, respectively. The maximum white muscle and whole-body protein growth rates recorded at Topt.G were 0.9 and 0.7 %·day–1, respectively. At Topt.GE, the maximum white muscle and whole-body PPV values were 28 and 34%, respectively, and kg/ks values were 92 and 51%, respectively. The growth performance data for juvenile Atlantic wolffish in comparison with published data for salmonids (rainbow trout (Oncorhynchus mykiss), Atlantic salmon (Salmo salar)) at 9–11°C further highlight its suitability as an alternative species for cold-water aquaculture in northern Europe and Atlantic Canada.