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. 1996 Sep 1;37(3):351–360. doi: 10.1186/BF03548101

Cataract Development in Atlantic Salmon (Salmo salar L) in Fresh Water

Kataraktutvikling hos oppdrettslaks (Salmo salar L) i ferskvannsfasen

E Bjerkås 113, R Waagbø 213, H Sveier 313, O Breck 413, L Bjerkås 513, E Bjornestad 613, A Maage 213
PMCID: PMC8063972  PMID: 8996880

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.

Keywords: aquaculture, growth rate, lens.

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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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