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• Epidemiology of Zoonotic Metacercaria in Fingerlings of Common carp (Cyprinus carpioLinnaeus, 1758) in Aquaculture Systems

  Kim Van Van, Nguyen Van Tho

  Received: 28-09-2012 / Accepted: 25-10-2012

   Abstract PDF (VIETNAMESE)

  Fingerling fish quality in aquaculture was concerned by the Fisheries Sector, specifically the Common carp, a traditional species raised in fresh water and more likely infected with zoonotic metacercaria. To investigate the epidemiological situation 1536 fingerling samples of common carp at size of 10.55 ± 1.51 g/fish from 54 waterbodies (ponds, canals, rivers, rice-fields) in 6 aquaculture systems (integrated fish-pig; fish-duck, rice-fish, biogas slurry, intensive culture and natural systems) was collected to test metacercaria by tissue digestion method. The result showed that the averaged prevalence was 23.89% and the intensity was 6.9 metacercaria/fish. High intensity occurred in natural and integrated systems, but low prevalence & intensity were found in biogas slurry and intensive culture systems. Three metacercaria species of small intestine flukes (Centrocestus formosanus, Haplorchis pumilio, H.taichui) and one metacercaria species of liver fluke (Clonorchis sinensis) were found in fingerlings of Common carp. Metacercaria of C. formosanus caused opened gill disease in fry and fingerling fish. Two metacercaria species of C. formosanus and H. pumilio were found with high prevalence and intensity (19.47-19.53%; 3.82-3.93 metacercaria/fish).

• Infectionof Trematode (Metacercariae) in Fingerlingand Grow-out Pangasianodon Catfish in Tiengiang Province, Vietnam

  Dinh Thi Thuy, Nguyen Quoc Chi

  Received: 04-12-2018 / Accepted: 11-05-2019

   Abstract PDF (VIETNAMESE)

  To determine the infection of fishborne zoonotic trematodes (FZT), metacercariae stage, in juveniles and grow-out Sutchi catfish in Tiengiang province,aresearch was conducded from April 2017 to April 2018 with a total of 272 grow-out fish (at 48 ponds) and 3320 fingerling fish (at 64 ponds). Fishsampleswere tested with the parasite method and metacercariae genus were identified by morphology method. It was found that fish were infected with Haplorchis pumilio metacercariae and the prevalences in the fish were higher during the rainy season compared to the dry season (the prevalence of fingerling pond was from 12.5 to 37.5% andgrow-out fish was from 12.1 to 30.0%for the rainy season; the respective figure were from 0.0 to 13.3% and from 0.0 to 25.0%for the dry season). Drying the pond bottom (<2 days), home made food, a snail's presence in ponds and dog/catpresence ) in the farming area were found to be the risk factors of FZT in the fish (P <0.05). Therefore, technical controls should be done to prevent and decrease the FZT prevalence in figerling and grow - out Pangasianodon catfish to contribute to the food safety and human health.