Abstract
The effect of extrusion processing and steam pelleting on pellet durability, pellet water absorption and the physiological response of rainbow trout reared upon these diets was investigated. Extruded pellets were observed to be more durable, had superior water stability and absorbed more water than steam pellets. Trout reared on extruded pellets had prolonged gastric emptying in comparison with those reared on steam pellets; this may have been responsible for the reduction in daily feed consumption. Trout reared on extruded pellets also showed significantly lower weight gain but higher feed efficiency than those reared on steam pellets. Liver: body weight ratio and percent liver glycogen were significantly higher in trout reared on the estruded pellets as compared with those reared on steam pellets. Thus, extrusion processing may increase the bioavailability of carbohydrate in the diet and the enlarged livers and increased liver glycogen content could impair liver function.
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