Acta Univ Latv (2003) 662: 45–50

Promotion of salmon rearing efficiency by including yeast extract Aqualase Two in the diet

Abstract

The effect of Baltic salmon growth and development treated with ß-glucan yeast extracts Aqualase Two was studied in the fish hatchery “Tome” and Latvian Fisheries Research Institute. A total of 30 000 fi sh from larvae (0+) to smolt stages were used in the experiment. Basic food with and without supplements of Aqualase Two (0.5 and 1 g kg-1) was used for feeding. Health of fish was regularly assessed. The investigations showed that testing the preparation decreased mortality during feeding and increased the rate of growth in autumn. The best results – lower mortality and greater increase in weight of smolts, were obtained in the group of fish fed glucan at dose of 0.5 g kg-1. The results of the experimental study showed that immunostimulation with a ß-glucan yeast preparation can be used to improve growth in industrial conditions.