Efeito a longo termo da temperatura do cultivo larvar no crescimento e fibras musculares de corvinas, Argyrosomus regius / Long-term effect of larval rearing water temperature on meagre, Argyrosomus regius, growth and muscle cellularity

Margarida Saavedra, Teresa Gama Pereira, Pedro Pousão-Ferreira, Ana Candeiesas-Mendes

Resumo


A temperatura de cultivo desempenha um papel fundamental no desenvolvimento dos peixes. Neste estudo foram testadas duas temperaturas durante a ontogenia larvar da corvina. Após este período, os alevins foram transferidos para tanques maiores, todos à temperatura ambiente, onde permaneceram até atingirem os 12 meses de idade. O crescimento e a área e densidade das fibras musculares foram analisados quando o peixe atingiu 1, 2, 4, 6 e 12 meses. Os resultados mostram que os alevins de 1 mês sujeitos a uma temperatura mais elevada (1.5º superior) apresentaram um maior comprimento, um maior peso seco (11 mg versus 7 mg) e uma maior frequência de fibras com uma área compreendida entre os 100 e os 200 µm2. Por outro lado, os alevins sujeitos a uma temperatura inferior apresentaram maior densidade de fibras (13493 mm2 versus 5689 mm2) e um maior recrutamento de novas fibras. A partir do momento em que todos os alevins passaram a estar à mesma temperatura (ao fim de 30 dias), as diferenças foram-se desvanecendo. O ponto de viragem parece ter sido aos quatro meses de idade, quando a média da área das fibras era superior no controlo (704 µm2 versus 540 µm2). De um modo geral, o recrutamento das fibras musculares diminuiu com a idade do peixe enquanto a engrossamento das fibras permaneceu constante. Este estudo mostra que o uso de diferentes temperaturas durante a ontogenia larvar pode provocar diferenças no crescimento assim como afetar a área e densidade das fibras musculares. No entanto, estas diferenças parecem ser mitigadas quando os peixes passam a estar à mesma temperatura.


Palavras-chave


corvina, crescimento, fibras musculares, hipertrofia e recrutamento de fibras, temperatura.

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Referências


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DOI: https://doi.org/10.34188/bjaerv5n2-057

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