Invasive Species Compendium

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Abstract

Effect of diet on the ultrastructure of the hepatopancreas in the white prawn (Penaeus schmitti).

Abstract

Ultrastructure of the hepatopancreas was studied by electron microscope in 8 groups of 13 white prawns (Penaeus schmitti) from breeding tanks in the Río Cauto, Cuba, given diets with different amounts of protein, lipids and carbohdyrates (25 to 45, 2 to 6, and 20 to 30%, respectively) for 45 days. Of the 4 types of cells identified (F, B, M and R cells) only R cells showed marked ultrastructural changes in relation to diet. Accumulation of lipid globules and degenerative and necrotic changes were greatest in groups given diets with protein, lipid and carbohydrate ratios of 35:6:20 and 25:2:20. Weight gain and relative growth was best, lipid accumulation in cells moderate and ultrastructural changes absent in prawns given diets with nutrient ratios of 35:2:20 and 35:6:25. Results indicate that ultrastructural changes in the hepatopancreas could be used to evaluate diets for prawns.