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| Towards a classification and an understanding of developmental relationships of vertebral body malformations in Atlantic salmon (Salmo salar L.) Witten, P.E.; Gil-Martens, L.; Huysseune, A.; Takle, H.; Hjelde, K. (2009). Towards a classification and an understanding of developmental relationships of vertebral body malformations in Atlantic salmon (Salmo salar L.). Aquaculture 295(1-2): 6-14. dx.doi.org/10.1016/j.aquaculture.2009.06.037
In: Aquaculture. Elsevier: Amsterdam; London; New York; Oxford; Tokyo. ISSN 0044-8486; e-ISSN 1873-5622
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| Abstract |
Expanding available systems to categorise skeletal malformations in different teleost species, we propose 20 types of salmon vertebral column malformations that are repetitively observed under farming conditions. As vertebral column deformities are usually diagnosed by X-ray, the classification of deformity types is based on radiological observations that have been obtained over the past 10 years from more than 5000 specimens. The proposed deformity types should be identifiable independent from the type (analogue, digital) and the quality of radiographs. We propose nine types of compression and fusion-related deformities, four types of abnormal radiotranslucent or radiopaque vertebral bodies, three types of spine curvatures, three types of symmetry deviations and displacement of vertebral bodies and one type of severe multiple malformations. Based on the suggested categories we discuss the relationships between types of vertebral body malformations. Several types of malformations involve the development of heterotopic cartilage, a pathology that is possibly linked to mechanical overload and accelerated growth. Refined categories for vertebral body malformations should help link particular types of malformations to particular causes. It should also help find out which deformities represent final stages and which deformities represent transitory stages. |
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