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One decade (2007-2017) successive investigations were conducted for environmental influence on the population dynamics of parasitic helminthes in pisces of the Gangetic plains. The fresh water crow fish of the Gangetic riverine ecosystem were found to be infected by allocreodoidean trematodes in gastro-intestinal region. The impacts of seasonality, hydrobiological and climatic factors vs. helminthes bio-ecology were reflected during investigation. The peak infection appeared to be in month of May and June. Size, weight and sex biased population dynamics of helminthes infections were well marked. Helminthes infections were found to be significantly influenced by dissolved oxygen, temperature and pollution parameters, substantiated and analyzed by the application of advanced numerical tool, SYSTAT 11. Therefore, the evidence of polyfactorial etiology is available. Thus no single factor could be segregated for typical peaks of infections duringinvestigation. The present study will provide a new dimension to fish farmers for management of fish farming in wild and artificial conditions. The weakness of the current investigation is that authors did not work out impact of artificial environmental factors in vitro.