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Development of low‐lipid formulated feeds with different protein/energy ratios for Octopus vulgaris ongrowing

Cerezo Valverde, J., Hernández, M.D., Aguado‐Giménez, F., García García, B.
Aquaculture nutrition 2017 v.23 no.4 pp. 681-691
Octopus vulgaris, body weight, diet, energy, feed conversion, feed formulation, lipid content, nutrient content, protein content, protein value, proximate composition
We studied the feeding and growth rates, feed efficiency and nutritional composition of subadult octopuses (689 ± 77 g) fed low‐lipid diets with two different protein/energy ratios (P/E): Medium P/E diet (30.5 g protein MJ⁻¹, 662 g kg⁻¹ protein dry weight (dw)) or High P/E diet (36.8 g protein MJ⁻¹, 843 g kg⁻¹ protein dw). Survival was 100% for the Medium P/E and 87.5% for the High P/E diet. The specific feeding rates were 1.91% and 1.67% body weight day⁻¹ for the Medium P/E and High P/E diet, respectively (P < 0.05). The specific growth rates (0.92% and 1.25% body weight day⁻¹), feed efficiency indices (47.3% and 72.7%), productive protein value (23.9% and 29.1%) and digestive gland index (5.6% and 6.4%) were significantly better in animals fed the High P/E than the Medium P/E diet (P < 0.05). The proximate composition of the digestive gland was similar for both diets, but the total lipid content of carcass was higher in animals fed the Medium P/E diet (P < 0.05). Our results suggest that the protein content of the feed could be a factor regulating feeding rates in octopus.