Abstract
The influence of water-borne insecticide and herbicide on the midgut glands of Penaeus monodon postlarvae was evaluated by light and electron microscopy. While the herbicide “Pyramin” (active substance: chloridazon) at a concentration of 10 ppm did not cause any detrimental effect, the midgut gland structure was heavily damaged in prawns contaminated with 1 ppm of the insecticide “Perfekthion” (active ingredient: dimethoate). The damage became apparent even before obvious changes in the behaviour of the animals occurred. The use of histology is therefore suggested as an additional tool to monitor the impact of water pollutants to prawns in aquaculture, since alterations in the midgut gland represent a highly sensitive overall response of these animals to the synergistic effect of their nutritional and physiological condition and the quality of the water.
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