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Factors affecting benthic impacts at Scottish fish farms.

Daniel J Mayor1, Alain F Zuur, Martin Solan

  • 1Institute of Biological and Environmental Sciences, Oceanlab, University ofAberdeen, Main Street, Newburgh, Aberdeenshire, Scotland AB41 6AA, UK. dan.mayor@abdn.ac.uk

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Fish farm size and current speed interact to affect seabed biology and chemistry. Organic waste accumulation is complex, influenced by depth and resuspension events, not just farm size alone.

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Area of Science:

  • Marine biology
  • Environmental science
  • Aquaculture science

Background:

  • Benthic environments near fish farms accumulate organic waste.
  • Understanding factors influencing this accumulation is crucial for sustainable aquaculture.

Purpose of the Study:

  • To investigate the factors affecting benthic biology and chemistry around Scottish fish farms.
  • To determine the relationship between farm size, current speed, depth, and organic waste.

Main Methods:

  • Linear mixed-effects models were used to analyze data from 50 Scottish fish farms.
  • Investigated interactions between farm size (maximum fish weight), current speed, distance, and depth.

Main Results:

  • A weak interaction between farm size and current speed influenced benthic macrofauna abundance and organic carbon.
  • Above 800-1000 t, effects were greater in high current speeds.
  • Organic matter accumulation was influenced by distance and depth interactions, suggesting resuspension benefits in shallow waters.

Conclusions:

  • Benthic impact of fish farms is more complex than previously assumed.
  • Farm size, current speed, and depth in isolation are poor predictors of benthic impact.
  • Sustainable aquaculture requires considering multiple interacting environmental factors.