Effect of Short—Term Exposure to Mercuric Chloride on the Air—Breathing Catfish,Hetero

Effect of Short—Term Exposure to Mercuric

Chloride on the Air—Breathing Catfish,Heteropneustes fossilis

MAYAS．PRASAD

【期刊名称】《生物医学与环境科学：英文版》 【年(卷),期】1994(007)004

【摘要】Alterations in the respiratory epithelium of gills of a catfish,Heteropneustes

fossilis

by

the

sublethal

and

lethal

concentrations of HgCl2 have been observed using scanning electron microscope,Fish exposed to 0.1ppm shows a thin coat of mucus,but the continuous layer of mucus is not retained in 0.3ppm after 24 h of exposure.Epithelial cells of the gill filament are hyperplastic.Other changes

in

the

respiratory

epithelium

are

contraction

of

epithelium,formation of interlamellar bridge and diminishing number of microridges.Massive destruction of the respiratory epithelium by deep lesions and sloughing of epithelial layer in 0.5 and 1.0ppm solutions after 6-12 h of exposure apparently causes death to the fish.SEM observations are well in conformity wit the findings made at light microscopic level.

【总页数】9页(P.337-345)

【关键词】氯化汞;短期接触;空气呼吸鲇鱼;鱼鳃;扫描电镜;呼吸上皮变化 【作者】MAYAS．PRASAD