<![CDATA[The presence of pollutants in water makes the environment toxic to all living biota and affects reproduction in fish. One of such pollutants is endosulfan, which is an off-patent organochlorine insecticide, widely used in various agricultural activities. Endosulfan is extremely toxic to fish and all other aquatic organisms, showing a range of chronic effects, including genotoxicity, and reproductive issues. Therefore, the aim of the research was to find the effect of endosulfan on cGnRH, sGnRH, GtH-I and GtH-II gene expression inmale hard-lipped barb fish. These fish were kept in aquarium containing several levels of endosulfan (0 mg/L [control]; 0.88 mg/L [low level]; 1.76 mg/L [medium level]; and 2.64 mg/L [high] level) for 60 days. The effects of endosulfan on GnRH performance on the fishwere evaluated by the expressions of these genes; cGnRH-II, sGnRH, GtH-I, and GtH-II. In the 8th week, there was a decrease in the expression of all the four genes in fish with high dose of endosulfan compared with the control group (P < 0.05). These findings showedthat endosulfan inhibits the expression of cGnRH, sGnRH, GtH-I and GtH-II genes in male hard-lipped barb.]]>
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