Journal
AQUACULTURE
Volume 270, Issue 1-4, Pages 142-148Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.aquaculture.2007.03.037
Keywords
rainbow trout; fin damage; fin erosion; animal welfare
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Fin damage, commonly referred to as fin erosion, has been highlighted as a welfare issue in farmed fish. An objective means for describing fin damage is required by both fish welfare researchers and the industry for quality assurance. For rapid quantitative assessments of fin size, 6-point photographic scales have been designed for small (<50 g) and large (> 50 g) fish, covering the range of fin damage observed on rainbow trout on UK farms. Inter- and intra-operator tests show that scoring is consistent both within and between operators. An experienced operator can assess all 7 rayed fins on a fish within 2 min. Additional qualitative descriptors (splitting, exposed rays, haemorrhage, inflammation, scaring/thickening, kinking/folding) have also been developed to categorise resultant malformations to the fins. Published by Elsevier B.V.
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