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Aquaculture Environment Interactions

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AEI 12:385-399 (2020)  -  DOI:

Application of polychaetes in (de)coupled integrated aquaculture: an approach for fish waste bioremediation

Marit A. J. Nederlof1,*, Jinghui Fang2,3, Thomas G. Dahlgren4,5, Samuel P. S. Rastrick6, Aad C. Smaal1,7, Øivind Strand6, Harald Sveier8, Marc C. J. Verdegem1, Henrice M. Jansen6,7

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

ABSTRACT: Development of benthic components within integrated multi-trophic aquaculture (IMTA) systems warrants more attention, and the development of polychaetes as an extractive component in IMTA systems is ongoing. This study estimates the bioremediation potential of Capitella sp. and Ophryotrocha craigsmithi for coupled and decoupled salmon-driven IMTA. In coupled IMTA, polychaetes receive fresh faeces, while in decoupled IMTA, preservation of faeces is applied. Respiration and ammonia excretion rates were measured for polychaetes fed fresh, oven-dried or acidified salmon faeces, and combined with nutrients incorporated into tissue growth, to estimate nutrient requirements. Nutrient requirements were subsequently used to evaluate bioremediation potential. Metabolic rates were highest for O. craigsmithi and contributed notably to their overall nutrient requirement (20-30%). For the 2 polychaete species, nutrient requirements ranged from 5 to 26 mg C and from 2 to 6 mg N g-1 AFDW d-1. These requirements were comparable with or higher than other polychaete species, highlighting the potential for fish waste bioremediation by Capitella sp. and O. craigsmithi. Preserved diets reduced bioremediation potential 1.5 and 3-5 times for, respectively, Capitella sp. and O. craigsmithi. Assuming that polychaetes are efficient fish-faeces convertors, the bioremediation potential indicates that benthic cultivation units containing 65000-95000 ind. m-2 of Capitella sp. or 36000-194000 ind. m-2 of O. craigsmithi can convert the daily organic waste flux deposited below an average salmon farm. These densities were within ranges reported for wild populations, indicating that, based on the bioremediation potential, development of benthic IMTA with these 2 polychaete species seems realistic and efficient for waste conversion.

KEY WORDS: Metabolic processes · Ophryotrocha craigsmithi · Capitella sp. · Benthic IMTA · Integrated multi-trophic aquaculture · Deposit feeders · Sustainability

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Cite this article as: Nederlof MAJ, Fang J, Dahlgren TG, Rastrick SPS and others (2020) Application of polychaetes in (de)coupled integrated aquaculture: an approach for fish waste bioremediation. Aquacult Environ Interact 12:385-399.

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