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The study of parasites of eels (Monopterus albus) from Bang-Nod canal, Hat Yai district, Songkhla province was investigated during July 2017 to June 2018 for a period of 12 months. The 15 eel samples were collected once a month. The average weight of the eels was 191.53±46.53 g while its length was 58.10±3.68 cm. Among the 180 eels investigated, 170 samples (94.44 %) were found to be infested with parasites. Six species of internal helminth parasites were found in ell tissues, including abdomen, intestine and stomach (with 54.37, 35.74 and 9.89 %, respectively). The identified parasites were 3 species of nematode (Capillaria philippinensis, Camallanus spp. and Procamallanus planoratus), 1 species of trematode (Clinostomum philippinensis), 1 species of cestode (Senga malayana) and 1 species of acanthocephalan (Pallisentis nagpurensis). Clinostomum philippinensis was found with the highest number. Procamallanus planoratus was found with the lowest number. Two species of parasites are found every month with high mean intensity, i.e. Clinostomum philippinensis (12.33 ind./fish) and Senga malayana. (10.51 ind./fish).
 Wikipedia, 2019, Asian Swamp Eel, Available Source: https://th.wikipedia.org/wiki, July 10, 2019. (in Thai)
 Fishery Statistics Research and Analysis Group Fisheries Policy and Strategy Division, 2018, Statistics of natural freshwater catch fishery year 2017, Document 16/2018 Fisheries Policy and Strategy Division, Department of Fisheries, 37 p. (in Thai)
 Phadi, P., 2009, Diseases and Disease Diagnosis of Fish, Odeon Store Publishing, Bangkok, 172 p. (in Thai)
 Bhaibulaya, M., Indra-Ngarm, S. and Ananthapruti, M., 1979, Freshwater fishes of Thailand as experimental intermediate hosts for Capillaria philippinensis, Int. J. Parasitol. 9: 105-108.
 De, N.C. and Ghosh, S.P., 1989, Larval and adult morphology of Camallanus anabantis Pearse, 1933 and C. kulasirii (Yeh, 1960) (Nematoda: Camallanidae) from freshwater fishes, with notes on the validity of some related forms, Syst. Parasitol. 14: 227-236.
 Sirikhan, P., 2003, Parasites of Aquatic Animals, 6th Ed., Skyward Advertising, Ltd., Bangkok, 270 p. (in Thai)
 Bush, A.O., Lafferty, K.D., Lotz, J.M. and Shostak, A.W., 1997, Parasitology meets ecology on its own terms: Margolis et al. revisited, J. Parastiol. 83: 575-583.
 Margolis, L., Esch, G.W., Holmes, J.C., Kuris, A.M. and Shad, G.A., 1982, The use of ecological terms in parasitology (report of an ad hoc committee of the American Society of Parasitologists), J. Parasitol. 68: 131-133.
 Rozsa, L., Reiczigel, J. and Majoros, G., 2000, Quantifying parasites in samples of hosts, J. Parasitol. 86: 228-232.
 Lerssutthichawal, T. and Supamattaya, K., 2005, Diversity and distribution of parasites from potentially cultured freshwater fish in Nakhon Si Thammarat, Songklanakarin J. Sci. Technol. 27: 333-345.
 Pornprasertphon, W., 1986, A Survey of the Helminth Parasite Infected in Pla-lai-na, Fluta alba (Zuiew), Master Thesis, Kasetsart University, Bangkok, 132 p. (in Thai)