Abstract
Although structural differences were not noticed in the tissues of gills and intestine obtained from control Anabas testudineus at 0400 and 1600 hr, remarkable variations in the structure were observed in both lindane (sub-lethal and lethal concentrations) and atropine sulphate (antidote) treatment at both these periods. The pathological effects observed in sub-lethal concentration of lindane at 0400 hr were relatively less when compared to 1600 hr. But in lethal exposure, a reverse effect was observed showing less effect at 1600 hr. Even though slight recovery was noticed in both the tissues after the fish were treated with atropine sulphate, the recovery observed after atropine sulphate in sub-lethal exposure was relatively very high when compared to atropine sulphate after lethal exposure.
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