Abstract
In-vitro simulations of the digestive process in silver carp were used to study the digestibility of a filamentous blue-green alga ( Anabaena flos-aquae) and of heterotrophic aerobic bacteria, and to explore their interrelations in the alimentary tract. After 9 h of incubation with the gut juice, only 9.5% of the algal protein was delivered as free amino acids. Bacteria were apparently not utilized. The loss of free amino acids and an increased ammonia production in samples containing algae or algae-bacteria mixtures indicated enhanced growth of the bacterial population during gut passage at the expense of the fish.
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