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The use of silages prepared from fish neural tissues as enrichers for rotifers ( Brachionus plicatilis ) and Artemia in the nutrition of larval marine fish

Identifieur interne : 001910 ( Main/Merge ); précédent : 001909; suivant : 001911

The use of silages prepared from fish neural tissues as enrichers for rotifers ( Brachionus plicatilis ) and Artemia in the nutrition of larval marine fish

Auteurs : Douglas R. Tocher [Royaume-Uni] ; Gabriel Mourente [Espagne] ; John R. Sargent [Royaume-Uni]

Source :

Aquaculture [ 0044-8486 ] ; 1997.

RBID : ISTEX:D3489C25DE01BAD2CCF9F24A72DA0E71B135153A

Abstract

Marine fish larvae have a requirement for large quantities of n − 3 highly unsaturated fatty acids (HUFA), particularly docosahexaenoic acid (DHA; 22:6n − 3), and dietary deficiencies of these induce a range of pathologies in fish including behavioural abnormalities. Therefore, there is a growing demand for natural lipids highly enriched in DHA as nutritional supplements during larval development. In the present study, DHA-rich products were obtained from fish neural tissues by a procedure involving ensiling in organic acids followed by neutralisation, drying, milling and sieving to produce the final paniculate, crumbed products. Lipid content varied in the neural tissue silages from 5.5% to 46.5% but all lipid contained high percentages of DHA and high DHA:EPA (eicosapentaenoic acid; 20:5n − 3) ratios ranging from 3.5 to 5.4. Tuna eye silage was a high lipid, high triacylglycerol (90.6% of total lipid) product and was particularly effective in increasing DHA content, outperforming a commercial product, in rotifer (Brachionus plicatilis) enrichment. Cod brain/eye silage had an intermediate content (18.2%) of lipid, which contained almost 50% as phospholipid, and proved as effective as a commercial enricher in increasing DHA content in Artemia nauplii. Moreover, Artemia nauplii, enriched with the cod brain/eye silage were more effective than nauplii enriched with a commercial enricher in increasing the DHA content of larval turbot brain. In conclusion, tuna eye and cod brain/eye silages are useful as enrichers of Artemia nauplii and rotifers for feeding marine fish larvae prior to weaning onto pelleted formulated diets.

Url:

https://api.istex.fr/document/D3489C25DE01BAD2CCF9F24A72DA0E71B135153A/fulltext/pdf

DOI: 10.1016/S0044-8486(96)01396-8

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<front><div type="abstract" xml:lang="en">Marine fish larvae have a requirement for large quantities of n − 3 highly unsaturated fatty acids (HUFA), particularly docosahexaenoic acid (DHA; 22:6n − 3), and dietary deficiencies of these induce a range of pathologies in fish including behavioural abnormalities. Therefore, there is a growing demand for natural lipids highly enriched in DHA as nutritional supplements during larval development. In the present study, DHA-rich products were obtained from fish neural tissues by a procedure involving ensiling in organic acids followed by neutralisation, drying, milling and sieving to produce the final paniculate, crumbed products. Lipid content varied in the neural tissue silages from 5.5% to 46.5% but all lipid contained high percentages of DHA and high DHA:EPA (eicosapentaenoic acid; 20:5n − 3) ratios ranging from 3.5 to 5.4. Tuna eye silage was a high lipid, high triacylglycerol (90.6% of total lipid) product and was particularly effective in increasing DHA content, outperforming a commercial product, in rotifer (Brachionus plicatilis) enrichment. Cod brain/eye silage had an intermediate content (18.2%) of lipid, which contained almost 50% as phospholipid, and proved as effective as a commercial enricher in increasing DHA content in Artemia nauplii. Moreover, Artemia nauplii, enriched with the cod brain/eye silage were more effective than nauplii enriched with a commercial enricher in increasing the DHA content of larval turbot brain. In conclusion, tuna eye and cod brain/eye silages are useful as enrichers of Artemia nauplii and rotifers for feeding marine fish larvae prior to weaning onto pelleted formulated diets.</div>
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The use of silages prepared from fish neural tissues as enrichers for rotifers ( Brachionus plicatilis ) and Artemia in the nutrition of larval marine fish

The use of silages prepared from fish neural tissues as enrichers for rotifers ( Brachionus plicatilis ) and Artemia in the nutrition of larval marine fish

Source :

Abstract

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