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Present study deals with effect of pentachlorophenol at low and high sublethal concentrations (6 and 32μg/l)on embryonic development of catfish Heteropneustes fossilis at different time intervals. The data show that fertilization rate was decreased and cleavage and blastula were severely affected leading to complete mortality of embryo. PCP exposure resulted in various body malformations in larvae, such as vertebral deformations, i.e. fin blistering/necrosis, axial deformities (lardosis, kyphosis and scoliosis) of the spine in the abdominal and caudal region, tail curved completely backward, shortened body, severe spinal and yolk sac malformations, C-shaped severe spinal curvature, cranial malformation with undeveloped head and failure of eye development. The level of body malformations increased with the concentration and exposure time. The prevalence of the contaminant, if not checked, can lead to decreased population and ultimate disappearance of the species.

EFECTS OF PENTACHLOROPHENOL ON EARLY EMBRYONIC AND LARVAL DEVELOPMENT OF THE CATFISH HETEROPNEUSTES FOSSILIS