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Las Palmas de Gran Canaria, Spain

Estefanell J.,Universitario Of Sanidad Animal guridad Alimentaria | Socorro J.,Universitario Of Sanidad Animal guridad Alimentaria | Socorro J.,Simon Bolivar University of Venezuela | Roo F.J.,Universitario Of Sanidad Animal guridad Alimentaria | And 3 more authors.
ICES Journal of Marine Science | Year: 2010

Octopus vulgaris is a suitable candidate for aquaculture, but there are problems with breeding in captivity, such as aggressive behaviour among males and the frequent death of females after the eggs hatch. To avoid these problems and further understand the sexual maturation of common octopus in captivity, males and females were reared together and separately under similar culture conditions. In all trials, the initial rearing density was 10 kg m-3. Females (n = 15, sex ratio 0:1) and males (n = 11, sex ratio 1:0) were kept in circular tanks, and a mixed group (n = 209, sex ratio 4:1) in floating cages. Trials started in November 2008 and octopuses from each treatment were examined macroscopically and histologically in December and January to assess sexual maturation. All the males matured, regardless of the sex ratio during rearing, as did all females in the mixed group. In contrast, a large proportion of the females kept isolated from males was still immature in December and January. Although maturation was successful in floating cages, there was 76 mortality there, in contrast to the zero mortality in tanks. Moreover, most of the dead octopuses from the cages were in post-reproductive condition, with a low digestive gland index, suggesting that this was natural post-reproductive mortality. Therefore, sex segregation is deemed advantageous to avoiding early mortality. © 2010 International Council for the Exploration of the Sea. Published by Oxford Journals. All rights reserved.

Estefanell J.,Universitario Of Sanidad Animal guridad Alimentaria | Socorro J.,Universitario Of Sanidad Animal guridad Alimentaria | Tuya F.,University of Las Palmas de Gran Canaria | Izquierdo M.,Universitario Of Sanidad Animal guridad Alimentaria | Roo J.,Universitario Of Sanidad Animal guridad Alimentaria
Aquaculture | Year: 2011

The octopus, Octopus vulgaris, is one of the main targets for aquaculture diversification in Mediterranean countries. However, the development of octopus farming is limited by the lack of information regarding nutritional requirements of this species during its life cycle. In this study, five diets were tested on the biological performance (growth, protein retention and biochemical composition) of individually reared octopuses (n = 8 per diet), including three single diets constituted by: an endemic crab (the white crab, Plagusia depressa), a commercial crab imported frozen (the blue crab, Portunus pelagicus), and bogue (Boops boops) discarded from fish farms (aquaculture by-product), as well as two mixed diets, containing a 60-40% of blue crab-bogue and white crab-bogue, respectively. The rearing period lasted 8. weeks. Octopuses that fed on a mixed diet constituted by blue crab-bogue showed a higher growth than those feeding on bogue as a single food item. No significant differences in growth were observed among individuals feeding on single food items. Highest protein retention was observed in octopuses fed on diets containing discarded bogue, associated with a high lipid and monoenes content in this food item, underlying the use of lipid as energy source in O. vulgaris. However, discarded bogue was deficient in ARA in comparison with octopus tissues, which did not seem to affect growth during the experimental period. These findings underline the potential of aquaculture by-products, particularly bogue, as an adequate diet for culturing O. vulgaris. © 2011 Elsevier B.V.

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