Effect of DDT congeners on reproductive function in male guppy (Poecilia reticulata)
2006
Surachai Pikulkaew(Chiang Mai University, Chiang Mai (Thailand). Faculty of Veterinary Medicine. Food Animal Clinic) | Dilok Wongsathein(Chiang Mai University, Chiang Mai (Thailand). Faculty of Veterinary Medicine. Food Animal Clinic)
Endocrine disrupters (EDs) such as DDT and its metabolite have been implicated in the impairment of reproductive performance via estrogenic actions in fish. This study was to evaluate the effect of DDT congeners on the reproductive performance of male guppies. Thirty male guppies were separated into 5 groups with 6 fish in each group. Group 1 was a control group, group 2 was fed with 0.10 ppb estradiol benzoate (positive control) and groups 3, 4 and 5 were fed with 0.05, 0.10 and 0.20 ppb of DDT congeners, respectively. Every group was treated for 30 days. Survival rates of groups 1-4 were 100 percent but for group 5, survival rate dropped to 66 percent. Male courtship behavior, caudal fin color intensity, gonopodial length and offspring sex ratio were not significantly different among groups. However, group 1 had higher rate of male sexual behavior and higher color intensity of caudal fins compared to the other groups. Group 2 fish had lower testis weight and fecundity than group 1 (p LT 0.05). Histopathological examinations showed that the testis of fish in groups 2, 3, 4 and 5 had more spermatozeumata and spermatids than spermatocyte. In addition, Sertoli cells and the efferent duct cells were hypertrophied and sperms were detached from the inner cells. In conclusion, DDT congeners impair male reproductive performance in guppies.
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