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Pelvetia canaliculata como suplemento de ração para dourada (Sparus aurata): uma abordagem de biorrefinaria para valorização da biomassa de algas
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Abstract(s)
O contínuo aumento do setor da aquacultura tem trazido várias preocupações, sendo uma delas os impactos ambientais que provoca, visto que as rações são fabricadas à base de ingredientes de origem marinha, tais como a proteína e o óleo de peixe. As algas marinhas têm sido alvo de estudos, devido aos seus compostos bioativos com diversas atividades como antioxidante, com o propósito de tornar as aquaculturas sustentáveis e economicamente viáveis. Este estudo teve como objetivo avaliar a incorporação da alga P. canaliculata em pó (1%, 5% e 10%) e resíduo da mesma alga (1% e 10%), obtidos após a sua suplementação em óleo de girassol, em rações para aquacultura de dourada (Sparus aurata), e os efeitos que esta incorporação teve no desempenho de crescimento, perfil hematológico, parâmetros imunológicos, metabólicos, stress oxidativo e perfil nutricional do músculo.
A suplementação das rações melhorou os parâmetros de crescimento, especialmente nos peixes alimentados com a dieta Resíduo 1%, não tendo afetado significativamente o perfil hematológico. No que respeitaao stress oxidativo, as douradasalimentadas com as dietas Pel 5% e 10% apresentaram melhores resultados, nomeadamente, nas atividades das enzimas catalase e superóxido dismutase. Nas análises da peroxidação lipídica, glutationa-s-transferase e glutationa total não se registaram diferenças provocadas pelas várias dietas estudadas. As amostras de músculo de peixes alimentados com a ração Pel 5% apresentaram o menor teor de lípidos, quantidade superior de proteína e maior percentagem de PUFA, características particularmente apreciadas pelos consumidores. Os resultados obtidos indiciam que a suplementação de rações com P. canaliculata liofilizada oucom oseu resíduo, obtidoapósincorporação em óleo de girassol, é adequada para a alimentação de juvenis de douradas em aquacultura.
The continuous development of the aquaculture sector has brought several concerns, one of which is the environmental impacts it causes, as aquafeeds are made from ingredients of marine origin, such as protein and fish oil. Seaweed has been the subject of studies due to its bioactive compounds with various activities such as antioxidant, with the purpose of making aquaculture sustainable and economically viable. This study aimed to evaluate the effect of incorporating algae powder (1%, 5% and 10%) and algae waste, obtained after sunflower oil supplementation (1% and 10%) in aquafeeds for gilthead seabream (Sparus aurata), and the effects this incorporation had on growth performance, hematological profile, immunological parameters, metabolic, oxidative stress and muscle nutritional profile. Supplementation improved growth parameters, especially in fish fed with Waste 1%, not having greatly affected the hematological profile. Regarding oxidative stress, the sea bream fed with the Pel 5% and 10% diets showed better results, especially in the activities of the enzymes catalase and superoxide dismutase. In the analyses of lipid peroxidation, glutathione-s-transferase and total glutathione there were no differences caused by the various diets studied. Muscle samples from fish fed with 5% Pel diet showed the lowest lipid content, higher amount of protein and higher percentage of PUFA, characteristics particularly appreciated by consumers. The results obtained indicate that the supplementation of diets withfreeze-dried P. canaliculata, or its residue, obtained after incorporation into sunflower oil, is suitable for the feeding of juvenile sea bream in aquaculture.
The continuous development of the aquaculture sector has brought several concerns, one of which is the environmental impacts it causes, as aquafeeds are made from ingredients of marine origin, such as protein and fish oil. Seaweed has been the subject of studies due to its bioactive compounds with various activities such as antioxidant, with the purpose of making aquaculture sustainable and economically viable. This study aimed to evaluate the effect of incorporating algae powder (1%, 5% and 10%) and algae waste, obtained after sunflower oil supplementation (1% and 10%) in aquafeeds for gilthead seabream (Sparus aurata), and the effects this incorporation had on growth performance, hematological profile, immunological parameters, metabolic, oxidative stress and muscle nutritional profile. Supplementation improved growth parameters, especially in fish fed with Waste 1%, not having greatly affected the hematological profile. Regarding oxidative stress, the sea bream fed with the Pel 5% and 10% diets showed better results, especially in the activities of the enzymes catalase and superoxide dismutase. In the analyses of lipid peroxidation, glutathione-s-transferase and total glutathione there were no differences caused by the various diets studied. Muscle samples from fish fed with 5% Pel diet showed the lowest lipid content, higher amount of protein and higher percentage of PUFA, characteristics particularly appreciated by consumers. The results obtained indicate that the supplementation of diets withfreeze-dried P. canaliculata, or its residue, obtained after incorporation into sunflower oil, is suitable for the feeding of juvenile sea bream in aquaculture.
Description
Keywords
Aquacultura Ração para aquacultura Economia circular Stress oxidativo Resposta imune Pelvetia canaliculata