Influence of natural diet on growth and biochemical composition of <Emphasis Type="Italic">Octopus vulgaris</Emphasis> Cuvier, 1797 |
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Authors: | Francesca Biandolino Giuseppe Portacci Ermelinda Prato |
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Institution: | (1) CNR—Institute for Coastal Marine Environment, Section of Taranto, Via Roma 3, 74100 Taranto, Italy; |
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Abstract: | The influence of diet on growth and biochemical composition of cultured Octopus vulgaris was investigated. Octopuses were reared in a open recirculation seawater system and during the experiment were kept apart in cages. Experiment
lasted 30 days. Three experimental dietary groups were established: group I (mixed diet: Carcinus mediterraneus, Boops boops and Mytilus galloprovincialis), group II (monodiet on B. boops) and group III (monodiet on M. galloprovincialis). The best results were obtained with the monodiet based on bogue that gave a weight gain of 390.65 ± 37.54, an absolute
growth rate of 13.02 g day−1 and feed efficiency of 44.79 ± 0.96%. Regarding to biochemical composition, the mussel-fed and bogue-fed groups showed the
highest protein content. Animals fed on bogue also showed the highest carbohydrate content, while the lowest value was observed
in the mussels-fed group. The lipid content was found to be very low in all dietary groups. Saturated fatty acids were the
most abundant fatty acid class, ranging from 58.22% in wild octopuses to 46.83% in bogues-fed octopuses. Polyunsaturated fatty
acids (PUFAs) were the second most abundant fatty acids class in all dietary treatments (25.65–37.00% as a per cent of total
FAs) except in octopuses fed with mussels. MUFAs ranged from 11.44 to 26.93% of total FAs. Although it is empirically known
that a varied diet better covers the nutritional requirements than a monodiet, the results of this study reveal that a monodiet
of B. boops may be used. |
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