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Potential of the polychaete Hediste diversicolor fed on aquaculture and biogas side streams as an aquaculture food source

Potential of the polychaete Hediste diversicolor fed on aquaculture and biogas side streams as an aquaculture food source

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Sammendrag
We evaluated the potential of the marine bristleworm Hediste diversicolor (Polychaeta) to recycle side streams from aquaculture and biogas production. Polychaetes were fed along a gradient from pure aquaculture sludge (SS) to pure solid biogas digestate (SBD) in 33% steps, with a positive control reared on fish feed (FF). Worms fed with FF showed the highest specific growth rate; there were no significant differences in growth rates among worms fed pure SS, pure SBD or their mixtures. While the diets differed ignificantly in protein concentrations, the worms showed comparable protein concentrations at the end of the 30 d rearing period (42−47% of dry weight). Lipid content in the worms was positively correlated with that in their diets. The worms on mixtures of SS and SBD with different ratios showed similar amino acid profiles. Fatty acid (FA) composition in the polychaetes reflected diet, where increased fractions of SBD resulted in an increase in long-chain polyunsaturated FAs, such as arachidonic (C20:4 n-6) and eicosapentaenoic (C20:5 n-3) acids, whereas increased ratios of SS increased docosapentaenoic (C22:5 n-3) and docosahexaenoic (C22:6 n-3) acids. These results suggest that polychaetes can recycle organic nutrients from aquaculture and biogas side streams into high-quality proteins and lipids, and can potentially serve as ingredients for aquafeeds.
Oppdragsgiver
  • Norges forskningsråd / 280836
  • Norges forskningsråd / 268338
Språk
Engelsk
Forfatter(e)
  • Wang Haiqing
  • Hagemann Andreas
  • Reitan Kjell Inge
  • Ejlertson Jørgen
  • Wollan Håvard
  • Handå Aleksander
  • malzahn Arne
Institusjon(er)
  • Norges teknisk-naturvitenskapelige universitet
  • SINTEF Ocean / Miljø og nye ressurser
  • Sverige
  • Andre institusjoner
År
2019
Publisert i
Aquaculture Environment Interactions
ISSN
1869-215X
Forlag
Inter-Research (IR)
Årgang
11
Side(r)
551 - 562