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Citation

Bell JG & Cowey CB (1989) Digestability and bioavailability of dietary selenium from fishmeal, selenite, selenomethionine and selenocystine in Atlantic salmon (Salmo salar). Aquaculture, 81 (1), pp. 61-68. https://doi.org/10.1016/0044-8486%2889%2990230-5

Abstract
Four groups of Atlantic salmon (Salmo salar), mean weight 68 g, were given diets for 4 weeks, in which the selenium (Se) was supplied from either fishmeal, sodium selenite, DL-selenomethionine or DL-selenocystine. Selenomethionine was the most digestible (92%) and fishmeal (47%) the least digestible source of Se. This was reflected in plasma Se concentration which was highest in fish given selenomethionine, although the activity of the enzyme glutathione peroxidase (GSH-Px) which contains Se was not significantly increased. Measurement of the GSH-Px:Se ratio indicated that Se supplied as selenite or selenocystine was a better source of Se for plasma GSH-Px than was Se from selenomethionine or fishmeal. Se concentration and GSH-Px activity in liver and erythrocytes were not significantly different in fish given the experimental diets for 4 weeks.

Journal
Aquaculture: Volume 81, Issue 1