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Estefanell J.,Instituto Universitario Of Sanidad Animal guridad Alimentaria Iusa | Roo J.,Instituto Universitario Of Sanidad Animal guridad Alimentaria Iusa | Guirao R.,CANEXMAR S.L. | Afonso J.M.,Instituto Universitario Of Sanidad Animal guridad Alimentaria Iusa | And 3 more authors.
Aquaculture Research | Year: 2012

The aim of this study was to evaluate growth, biochemical composition and dietary nutrients utilization in Octopus vulgaris fed on four diets based on bogue Boops boops, from different origin and in two presentations: fresh discarded bogue (aquaculture by-product) (DB-f), fresh wild bogue (low price trash species) (WB-f), discarded bogue agglutinated moist diet (DB-m) and wild bogue agglutinated moist diet (WB-m). Diets based on DB showed higher lipid content (19-26% dw) than those based on WB (5-6% dw). Octopuses fed on DB-based diets showed higher growth (1.5-1.9% day-1) and higher protein efficiency ratio (0.64-0.69) than those fed on WB-based diet (1.1-1.5% day-1 and 0.36-0.37 respectively), which suggests good utilization of dietary lipids and also a possible protein sparing effect by lipids in O. vulgaris. Octopuses fed on diets presented fresh showed a higher growth (1.9-1.5% day-1) and a higher feed efficiency (62-65%) than those fed on agglutinated diets (1.1-1.5% and 52-60% day-1 respectively). Regarding fatty acids, the digestive gland clearly reflected dietary lipid and fatty acid profile, while muscle showed a more stable composition. Low dietary ARA content reflected in octopus tissues, especially in specimens fed on DB-based diets, which did not seem to affect growth during the experimental period. © 2011 Blackwell Publishing Ltd.


Estefanell J.,Instituto Universitario Of Sanidad Animal guridad Alimentaria Iusa | Socorro J.,Instituto Universitario Of Sanidad Animal guridad Alimentaria Iusa | Izquierdo M.,Instituto Universitario Of Sanidad Animal guridad Alimentaria Iusa | Roo J.,Instituto Universitario Of Sanidad Animal guridad Alimentaria Iusa
Aquaculture Research | Year: 2013

The lack of specific compound diets for cephalopods is limiting the industrial development of some species. In this study, four agglutinated moist diets were tested in individually reared Octopus vulgaris (979 ± 151 g) for 8 weeks. All diets were based on bogue Boops boops, accidentally reared in fish farms (aquaculture by-product), and agglutinated with alginate and calcium. One diet was based exclusively on bogue fillets, two on bogue fillets complemented with meat from two crab species (Portunus pelagicus, Grapsus grapsus) and the last one on bogue and G. grapsus meals. As a control diet, bogue and P. pelagicus were supplied fresh on alternate days. All diets induced similar feed intake (2.1-2.6% day-1). However, the meal-based diet induced negative growth in comparison with the control and the other agglutinated diets (0.80-0.85% day-1). Higher lipid content in agglutinated diets (28-30% dw) in comparison with the control diet (16% dw) led to higher protein retention in muscle. These results underline the inadequacy of traditional meals in diets for cephalopods and that the inclusion of crab meat did not increase feeding rates and growth in O. vulgaris. The dietary fatty acid, with high levels of oleic and linoleic acid and low levels of ARA, clearly reflected in digestive gland, while only decreasing ARA and increasing EPA levels were observed in muscle, with no apparent negative effect on growth. © 2012 John Wiley & Sons Ltd.

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