Modeling particulate waste assimilation by blue mussels within the spatial constraints of a commercial fish farm: implications for multitrophic aquaculture

Frontiers in Marine Science

Marine Science

Adam D. Hughes¹  Birgitta Andreasen²  Bjartur Jacobsen²  Tróndur T. Johannesen²  Gunnvør á Norði²  Ivar Lund³  Daniel Taylor⁴ 

[1] Blue Economy Research, The Scottish Association for Marine Science (SAMS), Oban, United Kingdom;Department of Ecology, Fiskaaling, Hvalvík, Faroe Islands;Section for Aquaculture, The North Sea Research Centre, DTU Aqua, Technical University of Denmark, Hirtshals, Denmark;Section for Coastal Ecology, Danish Shellfish Centre, DTU Aqua, Technical University of Denmark, Nykøbing Mors, Denmark;

关键词: IMTA;    particulate waste;    blue mussels;    Atlantic salmon;    modelling;    spatial setup;    settling velocities;   

DOI  :  10.3389/fmars.2023.1236294

 received in 2023-06-07, accepted in 2023-07-27,  发布年份 2023

来源: Frontiers

【 摘 要 】

Commercial salmonid farming is typically performed in open-water net cages where interactions between the environment and production unit might be widespread and not easily predicted or controlled. Integrated multi-trophic aquaculture (IMTA) has been suggested to mitigate some of the environmental impacts. Based on empirical data, the assimilation of particulate waste from a commercial fish farm was modeled by two approaches to salmon/blue mussel IMTA: a system with mussels at the surface next to the fish farm and an alternative setup with mussels submerged under the farm. According to the model, 15% of the feed was defecated and assumed available to the mussels and the submerged mussel farm could assimilate 14.6% of the feces. Sensitivity analysis showed that the current speed, the mussel filtration rate, and the proportion of the material that settles slowly had an impact on this assimilation estimate, which could be significantly higher. However, the model did not include assimilation limitations due to particle size, which may contribute significantly to the submerged farm. The mussel farm at the surface mainly received small slow settling particles, and according to the model, only 0.4% of the fish farm waste was assimilated. The maximum obtainable assimilation was 5.5%. The fraction of slowly settling waste had the most pronounced influence on waste assimilation in the mussel farm at the surface. This is also among the most uncertain parameters, since the relative portion of different settling velocities of fish feces is highly variable, and more information on the size distribution of waste is needed.

【 授权许可】

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Copyright © 2023 á Norði, Lund, Andreasen, Taylor, Johannesen, Jacobsen and Hughes