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RNA, DNA and protein concentrations and amino acid profiles of deep-sea decapod Aristeus antennatus: An indication for seasonal variations of nutrition and growth

Published online by Cambridge University Press:  15 March 2004

Rui Rosa  and
Maria L. Nunes
Rui Rosa*
Affiliation:
Departamento de Inovação Tecnológica e Valorização dos Produtos da Pesca, IPIMAR, Avenida de Brasília, 1449-006 Lisboa, Portugal
Maria L. Nunes
Affiliation:
Departamento de Inovação Tecnológica e Valorização dos Produtos da Pesca, IPIMAR, Avenida de Brasília, 1449-006 Lisboa, Portugal
*
rrosa@ipimar.pt
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Abstract

Seasonal changes in nucleic acid concentrations and amino acid profiles in the muscle of juvenile Aristeus antennatus were investigated. RNA content, RNA:DNA and RNA:protein ratios varied significantly between seasons (p < 0.05), being the lowest and the highest values obtained in winter and spring/summer. A significant variation in the total amino acid content (TAA) from winter to summer was observed (p < 0.05). In fact, during this period a significant percent of increase in total non- (NEAA; 20.2%) and essential amino acids (EAA, 18.7%) contents occurred. Concomitantly, a significant decrease in the free amino acid (FAA) content from winter to summer was observed. A higher percentage of decrease with free essential amino acids (FEAA; 56.6%) in comparison to free non-essential amino acids (FNEAA; 34.2%) was attained. The significant increase in RNA and TAA contents from winter to summer may be related with protein synthesis. On the other hand, the lowest values obtained in winter may be due to a reduction in feeding activity; in this period the muscle protein must be progressively hydrolysed, which is evident with the higher FAA content. The liberated amino acids enter FAA pool and become available for energy production.

Keywords

Nucleic acidsAmino acidGrowthNutritional conditionAristeus antennatus / Red shrimp
Type
Brief Report
Information
Aquatic Living Resources , Volume 17 , Issue 1 , January 2004 , pp. 25 - 30
Copyright
© EDP Sciences, IFREMER, IRD, 2004

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