Fjelldal, Per Gunnar and Sankar, M and Vågseth, Tone and Pedersen, Audun Østby and Madaro, Angelico and Samantha, Bui and Kryvi, Harald and Stien, Lars Helge and Nilsson, Jonatan (2025) Vertebral deformities in cultured big size Rainbow Trout: Radiological analysis from juvenile to harvest size. Aquaculture. pp. 1-13. ISSN 1873-5622
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Abstract
Vertebral deformities are a big challenge in Rainbow Trout seawater aquaculture. However, supportive scientific literature is missing. The present study used radiology to follow the development of vertebral deformities in a population of farmed Rainbow Trout as they grew from 36 g to 5.5 kg. In addition, separately collected deformity screening data from three other farmed populations were included for comparison. The fish developed deformities in different vertebral regions over time, eventuating to affect almost the entire vertebral column. At this point, the fish were ∼ 5.5 kg and 93 % of the fish had one or more deformed vertebrae. A negative relationship between severity of deformity (number of deformed vertebrae per individual), and fish length and weight strongly suggest a negative impact on fish welfare. The most frequently affected area was the ural region of the vertebral column. This region is a part of the caudal fin complex which also suffered from degradation of the fin rays. Ural region deformities were also frequent in the separately investigated populations. The current results indicate that Rainbow Trout are not able to maintain normal bone development under current farming conditions, consequently, jeopardizing the welfare of the fish.
Item Type: | Article |
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Uncontrolled Keywords: | Rainbow Trout; Deformity; Vertebrae; Welfare; Tail fin |
Subjects: | Fish and Fisheries > Fish biology > age and growth Fish and Fisheries > Fish Disease Fish and Fisheries > Fish biology Aquaculture |
Divisions: | CMFRI-Kochi > Marine Biotechnology, Fish Nutrition and Health Division Subject Area > CMFRI > CMFRI-Kochi > Marine Biotechnology, Fish Nutrition and Health Division CMFRI-Kochi > Marine Biotechnology, Fish Nutrition and Health Division Subject Area > CMFRI-Kochi > Marine Biotechnology, Fish Nutrition and Health Division |
Depositing User: | Arun Surendran |
Date Deposited: | 16 Jul 2025 05:12 |
Last Modified: | 16 Jul 2025 05:12 |
URI: | http://eprints.cmfri.org.in/id/eprint/18963 |
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