魚類学雑誌
Online ISSN : 1884-7374
Print ISSN : 0021-5090
ISSN-L : 0021-5090
Histopathological Effects of the Insecticides, Heptachlor and Nicotine, on the Gills of the catfish, Heteropneustes fossilis
Sushil Kanta Konar
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1969 年 15 巻 4 号 p. 156-159

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Abstract Tne histopathological effects of the two insecticides, heptachlor and nicotine were studied on the gills of the freshwater catfish, Heteropneustes fossilis. The fishes exposed to 1.0 ppm of the former and 3.2 ppm of the latter at room temperature (18.89-23.89°C), died within 19 to 44 hours. The fishes exhibited acute respiratory distress with both the insecticides. The gills of fishes exposed to heptachlor were found coated with a layer of mucus, but no such covering was found on the gills of those died in nicotine. The surface cells of the gill filaments of fishes killed by heptachlor showed disintegration, rupture, vacuolation, karyorrhexis, and extrusion and degeneration of nuclei and cytoplasm. The number of mucous cells in these gills was increased which resulted in the secretion of mucus over them. With nicotine, only the basal parts of a few gill filaments were damaged. It appears that injury with heptachlor was due to surface irritation rather than absorption of the poison through the gills. The lesions caused by nicotine appear to be the indirect action of the poison. Due to paralytic action induced by this poison, the fishes failed to renew water of their opercular chamber which resulted asphyxiation and finally death. These findings strongly support the hypothesis put forth by Herr, Greselin and Chappel (1967) rejecting the views of Carpenter (1927), Jones (1935), Westfall (1945) and Derse and Strong (1963).

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© The Ichthyological Society of Japan
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