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Aquaculture Environment Interactions

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AEI 11:221-237 (2019)  -  DOI:

Application of polychaetes in (de)coupled integrated aquaculture: production of a high-quality marine resource

Marit A. J. Nederlof1,*, Henrice M. Jansen2,3, Thomas G. Dahlgren4,5, Jinghui Fang6,7, Sonnich Meier3, Øivind Strand3, Harald Sveier8, Marc C. J. Verdegem1, Aad C. Smaal1,2

1Department of Aquaculture & Fisheries, Wageningen University, 6708 WD Wageningen, The Netherlands
2Wageningen Marine Research, 4401 NT Yerseke, The Netherlands
3Institute of Marine Research, 5005 Bergen, Norway
4NORCE Norwegian Research Centre, 5006 Bergen, Norway
5Gothenburg Global Biodiversity Centre, Department of Marine Sciences, University of Gothenburg, 41319 Gothenburg, Sweden
6Key Laboratory for Sustainable Utilization of Marine Fisheries Resources, Ministry of Agriculture, Yellow Sea Fisheries Research Institute, Qingdao 266071, PR China
7Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, PR China
8Lerøy Seafood Group, 5020 Bergen, Norway
*Corresponding author:

ABSTRACT: Capitella sp. and Ophryotrocha craigsmithi received a diet of salmon feces to evaluate their potential to convert fish waste into valuable marine products, e.g. ingredients for fish feed formulation. Production rate and body composition (focusing on fatty acid [FA] profiles) were determined for polychaetes fed fresh, acid-preserved or oven-dried salmon feces to evaluate their application in (de)coupled integrated multi-trophic aquaculture (IMTA) systems. Coupled production refers to direct integration of fish and polychaetes within the same (eco)system, while in decoupled production, units can be spatially or functionally separated. For decoupled production, preservation of fish waste is recommended. Although diets contained relatively low polyunsaturated FA (PUFA) levels (5-9% of total FAs), both species were rich in PUFAs (>30% of total FAs) and contained the essential FAs for fish. Feeding Capitella sp. the acid-preserved diet enriched its FA profile. Accumulation of PUFAs, de novo synthesis and/or transfer via bacterial biomass could have played a role in the upregulation of PUFA content. Amino acid profiles indicated that these polychaetes contained the amino acids essential for fish. Highest growth for both species was observed when fed fresh feces, whereas preserved diets resulted in negative growth rates for O. craigsmithi, suggesting an important role of microbes in polychaete diets. Our results indicate that both species are potential valuable marine products. Given growth rates with different diets, O. craigsmithi seems more suitable for integration in coupled systems, while Capitella sp. is interesting for both coupled and decoupled integrated systems.

KEY WORDS: Integrated multi-trophic aquaculture · IMTA · Ophryotrocha craigsmithi · Capitella sp. · Fatty acids · Amino acids · Alternative fish feed ingredients · Specific growth rate

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Cite this article as: Nederlof MAJ, Jansen HM, Dahlgren TG, Fang J and others (2019) Application of polychaetes in (de)coupled integrated aquaculture: production of a high-quality marine resource. Aquacult Environ Interact 11:221-237.

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