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Las Palmas de Gran Canaria, Spain

Estefanell J.,Instituto Universitario Of Sanidad Animal guridad Alimentaria | Roo J.,Instituto Universitario Of Sanidad Animal guridad Alimentaria | Guirao R.,CANEXMAR | Izquierdo M.,Instituto Universitario Of Sanidad Animal guridad Alimentaria | Socorro J.,Instituto Universitario Of Sanidad Animal guridad Alimentaria
Aquacultural Engineering | Year: 2012

Some benthic cephalopods are considered potential candidates to diversify marine aquaculture, as they show fast growth and high market price. Most research on cephalopod culture is currently focusing on the development of specific enrichments and compound feeds, while little research has been conducted in order to test new rearing systems for cephalopods. The rigid characteristic of the floating cages commonly used for the ongrowing of Octopus vulgaris has restricted their use to calm water conditions (estuaries and harbors). Such sites are scarce and highly demanded, especially by the tourism industry; therefore the development of O. vulgaris grow out at these locations competes with touristic interests. The present study was set to compare the biological performance of O. vulgaris reared in a benthic cage (2m 2) as opposed to the traditional floating cage (2.5m 2), during two ongrowing trials. Initial rearing density was 10kgm -3 and octopuses (892±125g) were fed on bogue Boops boops, discarded from fish farms, for 60-67 days. High growth (1.8-1.9% day -1) and high survival (91-97%) were observed, regardless of the rearing system, and led to best biomass increment (178-212%) and food conversion rates (2.3-2.6) ever recorded for O. vulgaris under industrial rearing conditions. These results underline the adequacy of the benthic cage for the ongrowing of this species, and also the potential of aquaculture discarded fishes, particularly bogue, as a single diet for this species. High growth rates obtained and the high lipid content of bogue (44% dry weight) suggest efficient lipid utilization in this species. Proximate composition and fatty acid profile in octopus muscle was not affected by the rearing system. High dietary lipid content was not reflected in muscle proximate composition, which showed high protein (87% dw) and low lipid content (5% dw) by the end of the experimental period. Farmed octopus showed high levels of n-3 HUFA (42%), which should enhance its value for the consumers. © 2012 Elsevier B.V. Source


Estefanell J.,Instituto Universitario Of Sanidad Animal guridad Alimentaria | Roo J.,Instituto Universitario Of Sanidad Animal guridad Alimentaria | Fernandez-Palacios H.,Instituto Universitario Of Sanidad Animal guridad Alimentaria | Izquierdo M.,Instituto Universitario Of Sanidad Animal guridad Alimentaria | And 2 more authors.
Journal of the World Aquaculture Society | Year: 2012

Recently most research on cephalopod culture has focused on the development of new specific enrichments for paralarvae and compound feeds for juveniles and sub-adults. However, little research has been conducted in order to test new rearing systems, specifically designed to meet the particularities of these species. This experiment was set to compare the biological performance of Octopus vulgaris reared under traditional group conditions in floating cages (5 m 3) and individually in net cages (80 L), in two successive ongrowing trials. Octopuses (1565 ± 263 g) were fed a mixed diet containing crab and fish during 60 d. In general, higher mortality was observed in octopus reared under group conditions (28.1-36.7%) rather than individually (0-12.5%), related to breeding behavior and to weight dispersion along both trials. This led to highest biomass increment in octopus reared individually. However, the group rearing system had a positive effect on growth, reflecting in higher biomass increment and food conversion rates until 40-50 d of rearing. Accordingly, in order to maximize profitability of traditional group on growing, periodic grading and selection of males during the reproductive period are recommended. In addition, no difference in proximate composition and fatty acid profile was found in muscle regardless of rearing system. © by the World Aquaculture Society 2012. Source


Estefanell J.,Instituto Universitariode Sanidad Animal y Seguridad Alimentaria | Roo J.,Instituto Universitariode Sanidad Animal y Seguridad Alimentaria | Guirao R.,CANEXMAR | Izquierdo M.,Instituto Universitariode Sanidad Animal y Seguridad Alimentaria | Socorro J.,Instituto Universitariode Sanidad Animal y Seguridad Alimentaria
Aquaculture Research | Year: 2014

Two fresh diets were tested on the biological performance of males and females of Octopus vulgaris under industrial rearing conditions in floating cages. The presence of females could potentially release paralarvae to the natural environment ('integrated aquaculture'). Octopuses were fed on a single diet of bogue (aquaculture by-product), and on a mixed diet (60-40% crab-bogue), in two trials. In Trial 1 (918 ± 125 g), growth was higher in octopuses fed on the mixed diet (1.9-2.0%d-1) than in those fed on the bogue diet (1.8-1.9%d-1) irrespective of sex, and mortality was 3% regardless of sex and diet. In Trial 2 (1483 ± 269 g), growth was higher in males fed on the mixed diet (1.8%d-1) than in males fed on the bogue diet (1.4%d-1), both higher than females (1.1-1.3%d-1), and mortality was 22-28% regardless of sex and diet. Best biological performance in trial 1 was related to the lack of functional maturation in females, evidence by the low average gonadosomatic index (2.0-3.6%) in comparison with trial 2 (8.8-11.4%), regardless of diet. No correlations between final weight and sexual maturity indices were found, so the length of the rearing period to maximize biomass increment or to release paralarvae depends on functional maturation in females. © 2012 John Wiley & Sons Ltd. Source


Estefanell J.,Instituto Universitario Of Sanidad Animal guridad Alimentaria | Roo J.,Instituto Universitario Of Sanidad Animal guridad Alimentaria | Izquierdo M.,Instituto Universitario Of Sanidad Animal guridad Alimentaria | Socorro J.,Instituto Universitario Of Sanidad Animal guridad Alimentaria | Guirao R.,CANEXMAR
Journal of the World Aquaculture Society | Year: 2013

Octopus vulgaris is a potential candidate to diversify marine aquaculture. Even though mortality under rearing conditions has been related to reproductive processes, the benefit of sex segregation remains unclear. In order to clarify this, wild octopuses (862±101g) were reared in floating cages under three proportions of male:female sex ratio: 1:1, 1:0, and 4:1 (n=30 per treatment). The experimental period lasted 2 mo and octopuses were fed on bogue, Boops boops (aquaculture by-product). Higher growth rates were observed in octopuses reared under 1:1 and 1:0 (1.8%/d) in comparison with those reared under 4:1 conditions (1.6%/d). Regarding sexes, a lower growth was detected in females reared under 4:1 (1.1%/d) in comparison with females (1.8%/d) and males (1.7-1.9%/d) reared under 1:1 conditions. Survival was 97, 97, and 90% in sex ratio 1:1, 1:0, and 4:1, respectively. Sexual maturity data showed that males were all mature, while most females were still maturing (60-84%) at the end of the rearing period. High lipid content in bogue (44% dw) did not reflect on octopus muscle. This tissue showed a similar biochemical composition irrespective of the sex ratio condition, with a high protein (87% dw), a low lipid (5% dw), and a high n-3 HUFA content (42%). © by the World Aquaculture Society 2013. Source

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