ScienceAsia 23 (1997): 281-296 |doi: 10.2306/scienceasia1513-1874.1997.23.281

HISTOLOGICAL ALTERATIONS IN THE REPRODUCTIVE, NERVOUS AND DIGESTIVE SYSTEMS OF INDOPLANORBIS EXUSTUS INTOXICATED WITH MOLLUSCICIDES

PINICH WANGSOMNUK^a, E. SUCHART UPATHAM^a, MALEEYA KRUATRACHUE^a, YAOWALUK CHITRAMVONG^a AND PRAPEE SRETARUGSA^b

ABSTRACT: The snails, Indoplanorbis exustus were exposed to niclosamide, a synthetic molluscicide and the crude water extract of Brassaia actinophylla at the LC₅₀ concentrations for 24 hours. The results showed similar histological alterations in the organs of reproductive, nervous and digestive systems of snails exposed to both molluscicides. In the ovotestes, there were reduction in number and degeneration of spermatozoa and oocytes. In the cerebral ganglia, there were a lysis of neuropile, significant increases in cell and nuclear diameters of neurosecretory cells, and enlargement of vacuoles in the cytoplasm. In the epithelium of digestive tract, there were reduction of cilia, increase in mucus secretion, dilatation of cells and fragmentation of muscle tissue.

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a Department of Biology, Faculty of Science, Mahidol University, Rama 6 Road, Bangkok 10400, Thailand.
b Department of Anatomy, Faculty of Science, Mahidol University, Rama 6 Road, Bangkok 10400, Thailand.

Received 3 July, 1997