Understanding the biogeochemical impacts of fish farms using a benthic-pelagic model

Evgeniy V. Yakushev, Philip Wallhead, Paul E. Renaud, Alisa Ilinskaya, Elizaveta Protsenko, Shamil Yakubov, Svetlana Pakhomova, Andrew K. Sweetman, Kathy Dunlop, Anfisa Berezina, Richard G. J. Bellerby, Trine Dale

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Abstract

Sustainable development of the salmon farming industry requires knowledge of the biogeochemical impacts of fish farm emissions. To investigate the spatial and temporal scales of farm impacts on the water column and benthic biogeochemistry, we coupled the C-N-P-Si-O-S-Mn-Fe transformation model BROM with a 2-dimensional benthic-pelagic transport model (2DBP), considering vertical and horizontal transport in the water and upper 5 cm of sediments along a 10 km transect centered on a fish farm. The 2DBP model was forced by hydrophysical model data for the Hardangerfjord in western Norway. Model simulations showed reasonable agreement with field data from the Hardangerfjord in August 2016 (correlations between the model and observations were significant for most variables, and model biases were mostly <35%). The model predicted significant impacts on seafloor biogeochemistry up to 1 km from the fish farm (e.g., increased organic matter in sediments, oxygen depletion in bottom water and sediments, denitrification, metal and sulfur reduction), as well as detectable decreases in oxygen and increases in ammonium, phosphate and organic matter in the surface water near to the fish farm.

Original languageEnglish
Article number2384
JournalWater
Volume12
Issue number9
Early online date25 Aug 2020
DOIs
Publication statusPublished - Sep 2020

Keywords

  • Carrying capacity
  • Fish farming
  • Modeling
  • Observations
  • Oxygen depletion
  • Waste

ASJC Scopus subject areas

  • Biochemistry
  • Geography, Planning and Development
  • Aquatic Science
  • Water Science and Technology

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