Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.1/6027
Título: Formulation of feeds for Octopus vulgaris sub-adults in land-based conditions
Autor: Rodríguez González, Tania
Orientador: Sykes, António de Vilhena Andrade Ferreira
Cerezo Valverde, Jesús
Palavras-chave: Aquacultura
Octobus vulgaris
Polvo comum
Crescimento
Dietas
Eficiência
Jejum
Data de Defesa: 2013
Resumo: 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.
URI: http://hdl.handle.net/10400.1/6027
Designação: Mestrado em Aquacultura e Pescas
Aparece nas colecções:UA01-Teses

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Dissertation Tania Rodríguez MAF.pdf2,63 MBAdobe PDFVer/Abrir


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