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Positivity and Intensity of Gnathostoma spinigerum Infective Larvae in Farmed and Wild-Caught Swamp Eels in Thailand
The Korean Journal of Parasitology ; : 113-118, 2012.
Article in English | WPRIM | ID: wpr-146185
ABSTRACT
From July 2008 to June 2009, livers of the swamp eels (Monopterus alba) were investigated for advanced third-stage larvae (AL3) of Gnathostoma spinigerum. Results revealed that 10.2% (106/1,037) and 20.4% (78/383) of farmed eels from Aranyaprathet District, Sa Kaeo Province and those of wild-caught eels obtained from a market in Min Buri District of Bangkok, Thailand were infected, respectively. The prevalence was high during the rainy and winter seasons. The infection rate abruptly decreased in the beginning of summer. The highest infection rate (13.7%) was observed in September and absence of infection (0%) in March-April in the farmed eels. Whereas, in the wild-caught eels, the highest rate (30.7%) was observed in November, and the rate decreased to the lowest at 6.3% in March. The average no. (mean+/-SE) of AL3 per investigated liver in farmed eels (1.1+/-0.2) was significantly lower (P=0.040) than those in the caught eels (0.2+/-0.03). In addition, the intensity of AL3 recovered from each infected liver varied from 1 to 18 (2.3+/-0.3) in the farmed eels and from 1 to 47 (6.3+/-1.2) in the caught eels, respectively. The AL3 intensity showed significant difference (P=0.011) between these 2 different sources of eels. This is the first observation that farmed eels showed positive findings of G. spinigerum infective larvae. This may affect the standard farming of the culture farm and also present a risk of consuming undercooked eels from the wild-caught and farmed eels.
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Full text: Available Index: WPRIM (Western Pacific) Main subject: Seasons / Thailand / Prevalence / Aquaculture / Smegmamorpha / Gnathostomiasis / Parasite Load / Fish Diseases / Gnathostoma / Larva Type of study: Prevalence study Limits: Animals Country/Region as subject: Asia Language: English Journal: The Korean Journal of Parasitology Year: 2012 Type: Article

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Full text: Available Index: WPRIM (Western Pacific) Main subject: Seasons / Thailand / Prevalence / Aquaculture / Smegmamorpha / Gnathostomiasis / Parasite Load / Fish Diseases / Gnathostoma / Larva Type of study: Prevalence study Limits: Animals Country/Region as subject: Asia Language: English Journal: The Korean Journal of Parasitology Year: 2012 Type: Article