Lack of riboflavin in diet.
Validation: Low activity of erythrocyte glutathione reductase, low Liver or Kidney levels of Riboflavin.
Good if caught early. If not noticed many losses can occur, as even later correction will not repair the damage.
Cloudy lens is not reversible, but fish may survive; market value of fish is greatly reduced however. Haemorrhaging may stop with the addition of Riboflavin to the diet.
Ensure that adequate Riboflavin is included in the diet, at all stages.
Dr. Hughes, Stephen
National Biological Service
Maryland Cooperative Research Unit