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Publication
Formulation of feeds for Octopus vulgaris sub-adults in land-based conditions
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Abstract(s)
In the present study growth, feed efficiency, digestibility and condition of O. vulgaris fed
two different diets (FDb and Mb); and the effects of two (2FDb) or three starvation days
(3FDb) per week feeding with FDb diet were analyzed. The diets were formulated using
freeze-dried ingredients and only differed on bogue preparation; freeze-dried (diet FDb) or
meal prepared under 60˚C (Mb). Both diets were accepted, promoted growth and faeces
production with 100% of survival. No significant differences were found in growth (SGR of
0.78±0.19 %BWday-1 for FDb and 0.85±0.09 %BWday-1 for Mb) and feed efficiency
(48.31±9.70% and 39.22±2.92% for FDb and Mb, respectively) or PPV and LPV. Despite
the similarity on FCR (P>0.05), a better mean value was obtained by FDb (2.15±0.47)
compared to Mb (2.56±0.19). However, statistical differences were identified on ingestion
and DGI. In this sense, a higher ingestion were found on Mb group regarding to AFR
(P<0.01), APFR and ALFR (P<0.01) and SFR (P<0.05). The animals of Mb showed the
highest DGI (6.75±1.00 %). Faeces proximate composition differed between groups in
protein (P<0.05), lipid (P<0.05) and mineral content (P<0.01), which were reflected on
differences on ADC of nutrients (P<0.01). Nonetheless, the proximate composition of
tissues were similar between both groups (P>0.05). Growth and ingestion did not differ with
starvation protocols (P>0.05). FE displayed differences (P>0.05); the better FE and PPV
were performed by 3FDb (58.65±6.47% and 23.90±2.61%, respectively). Digestibility and
proximate composition of faeces and tissues were also similar (P>0.05). The results revealed
no loss on diet quality when dehydration is performed under 60˚C which point out the
suitability of bogue-meal for O. vulgaris feeds. It seems that growth and, survival and
proximate composition were not influenced by the applied starvation/feeding protocols. It
also seems that O. vulgaris has the ability to compensate starvation through an increase in
food intake on the subsequent day. The application of feeding protocols that include
starvation days might be an interesting option for industrial application since FE and FCR
were enhanced. This will promote a reduction in operational costs, such in manpower and
food.
Description
Keywords
Aquacultura Octobus vulgaris Polvo comum Crescimento Dietas Eficiência Jejum