Journal
AQUATIC BIOLOGY
Volume 4, Issue 1, Pages 7-13Publisher
INTER-RESEARCH
DOI: 10.3354/ab00090
Keywords
Aquaculture; Fatty acids; Food regimes; Gas chromatography-mass spectrometry; GC-MS; Nereis diversicolor; Polychaetes
Categories
Funding
- European Union [GT96 0603]
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Nereidid worms are well known to be key prey species for aquatic organisms, including economically important fish (e.g. plaice) and invertebrates (shrimps). Food regimes which include nereidids improve the reproductive fitness of cultured animals, i.e. the 'nereidid effect'. Aquaculture produces huge amounts of sludge, which might be recycled by feeding to the ragworm Nereis diversicolor. Here we analysed the fatty acid profiles in N. diversicolor over 1 yr for a wild population and for ragworms fed with commercial fish food or eel sludge. The omega-3 (omega-3) eicosapentanoic acid (20:5n3) was the most abundant fatty acid followed by palmitic (16:0), stearic (18:0) and oleic (18:1) acids. Biomass of the ragworms increased by 205 % in worms fed with fish food and remained stable in worms fed with eel sludge, indicating the good adaptation of individuals to the culture conditions. Only under fish food regimes were significant increases observed in saturated and total unsaturated fatty acids compared to natural food regimes. However, the omega-3 polyunsaturated fatty acids did not differ among food regimes, indicating that sludge from aquaculture is a good nutritive resource for N. diversicolor, This suggests the potential use of ragworms in aquaculture to reduce the production of waste and increase the reproductive fitness of cultivated animals.
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