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Using model selection to choose a size-based condition index that is consistent with operational welfare indicators.

Sonia Rey1, Jim Treasurer2, Connie Pattillo3

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Summary

Fish welfare in aquaculture requires reliable indicators. A new fin damage score for lumpfish (Cyclopterus lumpus) revealed that smaller fish in a group experienced more damage, highlighting the need for size grading.

Keywords:
aquaculturefin damagegradinghatcherylength-weight relationshipwelfare

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Area of Science:

  • Aquatic animal health and welfare
  • Aquaculture operational welfare indicators (OWIs)

Background:

  • Accurate fish health and welfare measures are crucial for managing wild and aquaculture populations.
  • Existing morphometric and energetic indices vary in ease of measurement and correlation with welfare.
  • Lumpfish (Cyclopterus lumpus) aquaculture requires validated, non-destructive welfare indicators.

Purpose of the Study:

  • To develop and validate a non-destructive fin damage score for lumpfish.
  • To assess the predictive power of different body condition indices on fin damage in lumpfish.

Main Methods:

  • Development of a lumpfish fin damage scoring system.
  • Testing four body condition indices (relative weight-length and relative to tank mates) as predictors of fin damage.
  • Utilizing model selection to identify the best predictive indices.

Main Results:

  • Fin damage severity was significantly predicted by smaller individual size relative to other fish in the same environment.
  • Standard length-weight relationship indices did not predict fin damage.
  • Relative size within a group is a key factor influencing lumpfish fin damage.

Conclusions:

  • Relative size within a group, not absolute length-weight, is a critical factor for lumpfish fin health.
  • Grading lumpfish by size in hatcheries is expected to mitigate fin damage.
  • Model selection is a powerful tool for identifying relevant welfare indicators in aquaculture.