Abstract: The study was conducted to collect and identify endoparasites of Channa punctatus (Bloch,1793) from different water bodies of varying water quality in Bangladesh and to determine the prevalence and intensity of infestation brought about by the endoparasites in the hosts. The host fishes were collected from polluted water at sewage treatment lagoon in Narayangong and fresh water at Tongi Hatchery in Gazipur, Bangladesh. The prevalence of endoparasites in the host fish Channa punctatus was 91.30% in female and 88.88% in male fishes, among them in polluted water fishes the prevalence was 85.71% in female and 86.66% in male and in fresh water fishes the prevalence was 100% in both the male and female fishes. The intensities of infestation in Channa punctatus was 6.78 in female and 6.55 in male fish collected from hatchery; and in sewage water fishes the intensity
was 3.50 in females and 1.15 in males respectively. Six parasite species were found from polluted water fishes and seven species of parasites were recorded from fresh water fishes. The parasite groups were trematodes (Genarchopsis bangladensis, Allogomtiotrema attu, Phyllodistomum sp., Neopecoelina saharanpuriensis), nematodes (Ascaridia sp., Procamallanus sp.) and Acanthocephalan (Pallisentis nandai). Acanthocephalans were found in the fishes collected from sewage lagoon. Liver, stomach, intestine and body cavity of the host fishes were examined for parasites. Females were more infected than the males. The intensity and the prevalence were higher in host fishes collected from hatchery than the sewage water host fishes. The hosts of intermediate length and weight
group were found to be more infected than smaller and larger length groups. [Nature and Science 2010;8(5):152- 156]. (ISSN: 1545-0740).