Wichit RojekittikhunTossapon ChaiyasithSupaporn NuamtanongChalit KomalamisraMahidol University2018-07-242018-07-242004-09-01Southeast Asian Journal of Tropical Medicine and Public Health. Vol.35, No.3 (2004), 523-530012515622-s2.0-8444223945https://repository.li.mahidol.ac.th/handle/20.500.14594/21541Between August 2000 and August 2001, 12,216 fish of 73 species were purchased from several local markets in Nakhon Nayok Province, Thailand, and examined for the presence of Gna-thostoma larvae. Almost all species were fresh-water fish that had grown naturally, rather than raised commercially. Eight species were found to be infected with gnathostome larvae. The overall prevalence was 5.1% (626/12,216) and a total of 5,969 larvae was recovered. The highest rate of infection (30.1%) was found in Monopterus albus (swamp eel). The rates in the remaining infected fish were as follows: Anabas testudineus (climbing perch) 7.7%, Channa striata (striped snake-head fish) 7.4%, Clarius macrocephalus (Gunther's walking catfish) 6.7%, Channa micropeltes (giant snake-head fish) 5.1%, Channa lucius (blotched snake-head fish) 4.0%, Clarius batrachus (Batrachian walking catfish) 1.4%, and Ompok krattensis (butter sheatfish) 0.6%. The mean number of larvae/fish was highest in swamp eels (10.0 larvae/eel), and the maximum number of 698 larvae was recovered from one eel. The body sizes of the recovered G. spinigerum advanced third-stage larvae were 2.70-5.10 mm in length (average, 3.97 ±0.50 mm) and 0.29-0.60 mm in width (average, 0.40 ± 0.04 mm). The average number of cephalic hooklets of the larvae from rows 1 to 4 were 41.8 ± 0.5 (range, 40-43), 43.6 ± 0.6 (range, 42-45), 46.1 ± 0.9 (range, 44-48) and 49.3 ± 0.7 (range, 48-51), respectively.Mahidol UniversityMedicineArticleSCOPUS