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Cataract Development in Atlantic Salmon (Salmo salar L) in Fresh Water
Kataraktutvikling hos oppdrettslaks (Salmo salar L) i ferskvannsfasen
Acta Veterinaria Scandinavica volume 37, pages 351–360 (1996)
Abstract
Irreversible bilateral cataracts were diagnosed by slit-lamp biomicroscopy in 178 of 200 farm-raised Atlantic salmon (Salmo salar L) fed a standard diet over a five-month period. Initial changes were anterior polar opacities, progressing to involve both the anterior and posterior cortex before changes in the lens nucleus were seen. The lens changes were recorded and given scores according to the severity of the cataracts. At each of 3 samplings, after 2, 4 and 5 months, 200 fish were measured, weighed and examined by slit-lamp biomicroscopy. At all 3 samplings, there was a significant correlation between body length and both cataract incidence and cataract severity. There was also a significant correlation between body weight and cataract incidence and severity for the 2 last samplings. There was a significant correlation between K-factor as a measure of the shape of the fish, and both cataract incidence and severity, at all 3 samplings. Evaluation of specific growth rate in the periods between the examinations showed that the rapidly-growing fish were most susceptible to cataract formation. After cataract developed, however, the growth rate slowed. Follow-up examination of severely affected fish 3 months after transfer to sea water showed a normal cortical zone in the periphery of the lens in 24 out of 28 fish.
Sammendrag
Irreversibel bilateral katarakt ble diagnostisert med spaltelampe-biomikroskop hos 178 av 200 oppdrettslaks (Salmo salar L) foret med en standarddiett i 5 måneder. De tidligste kataraktforandingene var lokalisert til fremre linsepol med progresjon til bakre cortex før utvilking av forandringer i linsekjernen.
To hundre fisk ble undersøkt etter 2, 4 og 5 måneder. Ved alle 3 prøveuttak var det signifikant korrelasjon mellom kroppslengde og kataraktinsidens og utbredelse av forandringene i linsen. Det var også signifikant korrelasjon mellom kroppsvekt og kataraktforandinger ved de 2 siste uttakene. Det var signifikant korrelasjon mellom K-faktor som et mål på fiskens fasong og kataraktinsidens og utbredelse ved alle 3 uttak. Etterkontroll av fisk med store linseforandinger 3 måneder etter overflytting til sjøvann viste vekst av normalt linsevev i periferien av linsen hos 24 av 28 fisk. Rasktvoksende fisk var mest utsatt for katarakt, men etter utvikling av linseforandringer, ble det påvist redusert veksthastighet.
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Acknowledgment
The authors thank the staff at MOWI, Glomfjord, led by Tor Arne Gransjøen, for their co-operation in the project, Mr. Rolf Benjaminsen, Felleskjøpet Trondheim, Bodø Branch, for coordinating the practical arrangements, and Mrs. Astrid Leirvik for practical assistance. This study was financed by A/S Mowi and Felleskjøpet Havbruk A/S.
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Bjerkås, E., Waagbø, R., Sveier, H. et al. Cataract Development in Atlantic Salmon (Salmo salar L) in Fresh Water. Acta Vet Scand 37, 351–360 (1996). https://doi.org/10.1186/BF03548101
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DOI: https://doi.org/10.1186/BF03548101