Activity of Digestive Enzymes in Perch Infected with Triaenophorus nodulosus (Pallas) Plerocercoids

Abstract

It is revealed that the infection of older groups of perch with T. nodulosus plerocercoids reduces the activity of enzymes, ensuring the initial stages of the assimilation of protein components in fish food. The infection does not affect the activity of glycosidases. The infection changes the ratio of activities of the above groups of enzymes and possibly reduces the efficiency of fish feeding. In addition, the proportion of serine proteinases and metalloproteinases decrease, while the percentage of unidentified proteases significantly increases in the gut of infected fish.