title: Susceptibility, metacercarial burden, and mortality of juvenile silver barb, common carp, mrigal, and tilapia following exposure to Haplorchis taichui.
abstract: Fish-borne zoonotic trematodes (FZT) including heterophyids and opisthorchiids are prevalent in native and aquaculture fish in Southeast Asia. FZT are reported highly prevalent in juvenile aquaculture fish that belonged to the family Heterophyidae, particularly Haplorchis taichui. Aquaculture fish are reported to have varying levels of natural infection with H. taichui, but data for their susceptibility as well as resistance to infection are not available. The aim of this study was to determine the susceptibility of five aquaculture fish to H. taichui. Experimental infections were performed by exposing fish individually to 0 (control), 50, 100, or 200 H. taichui cercariae for 12 h. Metacercarial burden was measured at 45 days postinfection. Three out of five fish species, silver barb (Barbonymus gonionotus), common carp (Cyprinus carpio), and mrigal (Cirrhinus mrigala), were highly susceptible to H. taichui infection with percentage ranging from 93.33 to 100%. The Nile and red tilapia were not susceptible to infection. Among the susceptible fish species, silver barb had higher intensity of H. taichui metacercariae than common carp and mrigal (P < 0.001). Metacercarial burden significantly correlated with the dose of cercarial infection (P < 0.001). Our findings that common aquaculture fish species have varying degrees of susceptibility to H. taichui infection provide important information to reduce parasite transmission in aquaculture fish.
authors: Department of Parasitology, Faculty of Medicine, Khon Kaen University, Khon Kaen, 40002, Thailand.
authors: Kulthida
authors: K
authors: Kopolrat
authors: Paiboon
authors: P
authors: Sithithaworn
authors: Smarn
authors: S
authors: Tesana
authors: Ross H
authors: RH
authors: Andrews
authors: Trevor N
authors: TN
authors: Petney
mesh_terms: D000818:Animals; D017756:Aquaculture; D002347:Carps / Q000254:growth & development / Q000469:parasitology; D003530:Cyprinidae / Q000254:growth & development / Q000469:parasitology; D004198:Disease Susceptibility; D005393:Fish Diseases / Q000401:mortality / Q000469:parasitology*; D006578:Heterophyidae / Q000254:growth & development / Q000502:physiology*; D058488:Metacercariae / Q000254:growth & development; D015995:Prevalence; D017210:Tilapia / Q000254:growth & development / Q000469:parasitology; D014201:Trematode Infections / Q000401:mortality / Q000469:parasitology / Q000662:veterinary*
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