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The nutrition value of fish fillet is related to fish maturation or fish age?

ABSTRACT: Integrated analysis of transcriptomics and metabolomics in Blunt Snout Bream. With the improvement of living standards, people’s demand for food nutrient is getting higher and higher. Fish is one kind of protein-rich food and is increasingly favored by consumers. It has been well recognized that flesh composition of fish is closely related to its maturation and growth stages, but few researches have explored these differences. Besides, hormone residues in fish after artificial inducing reproduction also attract consumers’ concern. In this study, we try to address these concerns by using a combination of transcriptomics and metabolomics analysis to identify the key pathways, genes, and metabolites regulation which may affect flesh nutrition of one typical aquaculture species in China, blunt snout bream (Megalobrama amblycephala).

ORGANISM(S): Megalobrama Amblycephala Fish

TISSUE(S): Muscle

SUBMITTER: Ningnan Guan

PROVIDER: ST001112 | MetabolomicsWorkbench | Tue Sep 19 00:00:00 BST 2017

REPOSITORIES: MetabolomicsWorkbench

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Project description:Background: Food supply is a major factor influencing growth rates in animals. This has important implications for both natural and farmed fish populations, since food restriction may difficult reproduction. However, a study on the effects of food supply on the development of juvenile gonads has never been transcriptionally described in fish. Methods and Findings: This study investigated the consequences of growth on gonadal transcriptome of European sea bass in: 1) 4-month-old sexually undifferentiated fish, comparing the gonads of fish with the highest vs. the lowest growth, to explore a possible link between transcriptome and future sex, and 2) testis from 11-month-old juveniles where growth had been manipulated through changes in food supply. The four groups used were: i) sustained fast growth, ii) sustained slow growth, iii) accelerated growth, iv) decelerated growth. The transcriptome of undifferentiated gonads was not drastically affected by initial natural differences in growth. Further, changes in the expression of genes associated with protein turnover were seen, favoring catabolism in slow-growing fish and anabolism in fast-growing fish. Moreover, while fast-growing fish took energy from glucose, as deduced from the pathways affected and the analysis of protein-protein interactions examined, in slow-growing fish lipid metabolism and gluconeogenesis was favored. Interestingly, the highest transcriptomic differences were found when forcing initially fast-growing fish to decelerate their growth, while accelerating growth of initially slow-growing fish resulted in full transcriptomic convergence with sustained fast-growing fish. Conclusions: Food availability during sex differentiation shapes the juvenile testis transcriptome, as evidenced by adaptations to different energy balances. Remarkably, this occurs in absence of major histological changes in the testis. Thus, fish are able to recover transcriptionally their testes if they are provided with enough food supply during sex differentiation; however, an initial fast growth does not represent any advantage in terms of transcriptional fitness if later food becomes scarce.

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The nutrition value of fish fillet is related to fish maturation or fish age?

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