Toxic Impact Of Endosulfan On Gills Of Clarias Batrachus Linn

INTRODUCTION:

The organochlorine pesticide endosulfan (6,7,8,9,10,10-Hexachloro-1,5,5a,6,9,9a-hexahydro-6,9-methano-2,4,3-benzodioxathiepin-3-oxide) could be a chlorinated hydrocarbon which is considered the most toxic pesticides for marine existence, especially fish, and thus remains registered as being a priority pollutant using the US Ecological Protection Agency. Specifically in developing countries, endosulfan reaches general use for bug elimination in jute, cotton, sugar cane and vegetables. Because of farming activities, endosulfan has frequently been reported in surface waters and soil of developing and established countries. It’s more toxic for that fish kind of the current study, because the fish could be a dirt occupant and stays in touch for that soil for extended time. Endosulfan is moderately persistent within the soil atmosphere obtaining a reported average field half-info on fifty days. Acute toxicity of endosulfan to fish was reported formerly.

Previous histopathological studies on fishes uncovered to pollutants states fish organs are efficient indicators water quality. The gills are very important organs in fish to accomplish respiration, osmoregulation, acidity base balance and nitrogenous waste excretion. Fish gills can also be vulnerable to pollutants in water due to their large area and exterior location. For this reason, fish gills are thought because so many appropriate indicators water quality levels. Many investigators have reported the histopathological adjustments to the gills of several striper uncovered to many pesticides. However, there’s little info on the histopathological impact of endosulfan on fish gills.. Therefore, it had been decided to uncover the histopathological connection between gills within the catfish, Clarias batrachus Linn. uncovered chronically to endosulfan inside our research.

Techniques And Materials:

Adult fish through getting an average bodyweight of .2 ± .03 Kg and total time period of 20 ± .4 cm were collected from your market. The fish were transferred in oxygenated containers for that laboratory. These were acclimated in glass aquaria in the constant temperature (24±l°C) and pH 7.5 ± .3 for seven days before the experiment. Aged regular faucet water was requested acclimation and for preparing test solutions. Water was continuously aerated. Fish received two occasions daily with Tubifex tubifex. Technical grade endosulfan (Thiodan®, 33.70% endosulfan) was supplied by Hoechst Co. India Limited.

The fish were separated into two groups and hang into separate glass aquaria. Ten fishes were selected for every group. Group I had been uncovered to commercial formulations of endosulfan. The nominal concentrations tested were .5 µg/L for endosulfan, may be the l/twelfth fractions within the 96h LC50 value. Group II was maintained in pesticide-free water for everyone as control. Half the quantity of test water was restored every round-the-clock. The standard values for the water quality data were, temperature 24±l°C, pH 7.5 ± .3, dissolved oxygen 7.2 mg/L and total hardness 168 mg/L as CaCO3.

Clarias batrachus uncovered to endosulfan didn’t show any alteration in behavioural patterns and feeding activity. Likewise, growth wasn’t retarded following reference to endosulfan, and aside from mucus secretion no macroscopically overt symptoms of pathology might be discovered during dissection.a