Development of low‐lipid formulated feeds with different protein/energy ratios for Octopus vulgaris ongrowing |
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| Authors: | J Cerezo Valverde MD Hernández F Aguado‐Giménez B García García |
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| Institution: | Marine Aquaculture Station, IMIDA‐Murcia Institute of Agri‐Food Research and Development, Puerto de San Pedro del Pinatar, Murcia, Spain |
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| Abstract: | 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. |
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| Keywords: | formulated feed low lipid level
Octopus vulgaris
P/E ratio protein proximate composition |
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