Experiments on the Evaluation of the Blood Feeding of Heterobothrium okamotoi (Monogenea: Diclidophoridae)

Ogawa, Kazuo; Yasuzaki, Masayoshi; Yoshinaga, Tomoyoshi

doi:10.3147/jsfp.40.169

Cited by 11 publications

(4 citation statements)

References 9 publications

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“…This is the first report to present evidence of the efficacy of orally administered benzimidazole against mature worms of H. okamotoi. This finding may be significant, as the amount of blood ingested by mature worms is significantly greater than that ingested by immature worms (Ogawa et al, 2005), and the only medicine against H. okamotoi that has been used until now in culture field is hydrogen peroxide, which mainly attacks immature worms.…”

Section: Discussionmentioning

confidence: 99%

Efficacy of Orally Administered Febantel against Monogenean Heterobothrium okamotoi infection of Cultured Tiger Puffer Takifugu rubripes

武志¹,

守²,

昌功

et al. 2006

Fish Pathol.

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ABSTRACT-We examined the efficacy of febantel against the infection of the diclidophorid monogenean Heterobothrium okamotoi in cultured tiger puffer Takifugu rubripes. Febantel is a prodrug of fenbendazole, a benzimidazole drug, which is widely used in the field of veterinary medicine. Febantel was metabolized to fenbendazole in tiger puffer just like veterinary animals for oral administration. At the doses of 12.5 mg/kg and 25 mg/kg for 5 days, and 50 mg/kg for 3 days, 88%, 96% and 94%, respectively, of mature worms, and 97%, 95% and 97%, respectively, of immature worms were eradicated at 22-23∞C. These results suggest that febantel has high anti-H. okamotoi activity.

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Section: Discussionmentioning

confidence: 99%

Efficacy of Orally Administered Febantel against Monogenean Heterobothrium okamotoi infection of Cultured Tiger Puffer Takifugu rubripes

武志¹,

守²,

昌功

et al. 2006

Fish Pathol.

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“…Fish with high parasite infection intensities may become unhealthy and suffer from tissue damage, emaciation, anaemia and in extreme cases, mortality. The sanguinivorous parasite Heterobothrium okamotoi (Diclidophoridae) consumes greater quantities of host ( Takifugu rubripes ) blood as it develops and grows and when mature, a single specimen can consume 0·69 μl over 12 h (Ogawa et al 2005). High infection intensities of this parasite species are associated with host anaemia, which is characterized by low haematocrit and haemoglobin levels (Ogawa and Inouye, 1997).…”

Section: Discussionmentioning

confidence: 99%

Egg-laying patterns and in vivo egg production in the monogenean parasites Heteraxine heterocerca and Benedenia seriolae from Japanese yellowtail Seriola quinqueradiata

2008

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SUMMARYEgg-laying patterns and egg production in Heteraxine heterocerca from the gills and Benedenia seriolae from the skin of Japanese yellowtail Seriola quinqueradiata in Japan were investigated in vivo. Eggs were collected every 3 h from sexually mature H. heterocerca and B. seriolae infecting 3 S. quinqueradiata kept individually over 3 consecutive days and exposed to alternating periods of illumination and darkness (LD 12:12; light on 06.00, light off 18.00) and maintained at 23·8±0·1°C and 35 ppt salinity. A well-defined egg-laying rhythm was demonstrated for H. heterocerca while B. seriolae was shown to release eggs continuously. A total of 114 000 H. heterocerca eggs was collected and of these, 45·4 (42·5–49·9)% were collected during the first 3 h period following dark at 18.00 h. A total of 662 857 B. seriolae eggs was collected and these were distributed over each 3 h period ranging from 11·1 to 14·1% of the daily egg output. All eggs extracted from the uterus of each H. heterocerca were joined together forming an ‘egg-string’. The contrasting egg-laying patterns of H. heterocerca and B. seriolae suggest that each species makes use of a different infection strategy to infect the same host species, S. quinqueradiata.

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“…in Nov). No details relating to the magnitude of loss are provided but losses of 10% in 125 m 3 cages stocked at 2•5 kg m 3 , with a harvest price of US$ 22•00(1996)(1997)(1998)(1999)(2000)(2001)(2002), are assumed 688 per cageOgawa and Inouye (1997);Ogawa et al (2005b) Parasites produce eggs in strings that can exceed 2 m in length. These become caught in the net mesh, accumulating and representing a source of infection.…”

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confidence: 99%

Economic costs of protistan and metazoan parasites to global mariculture

Shinn¹,

et al. 2014

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Parasites have a major impact on global finfish and shellfish aquaculture, having significant effects on farm production, sustainability and economic viability. Parasite infections and impacts can, according to pathogen and context, be considered to be either unpredictable/sporadic or predictable/regular. Although both types of infection may result in the loss of stock and incur costs associated with the control and management of infection, predictable infections can also lead to costs associated with prophylaxis and related activities. The estimation of the economic cost of a parasite event is frequently complicated by the complex interplay of numerous factors associated with a specific incident, which may range from direct production losses to downstream socio-economic impacts on livelihoods and satellite industries associated with the primary producer. In this study, we examine the world's major marine and brackish water aquaculture production industries and provide estimates of the potential economic costs attributable to a range of key parasite pathogens using 498 specific events for the purposes of illustration and estimation of costs. This study provides a baseline resource for risk assessment and the development of more robust biosecurity practices, which can in turn help mitigate against and/or minimise the potential impacts of parasite-mediated disease in aquaculture.

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Experiments on the Evaluation of the Blood Feeding of Heterobothrium okamotoi (Monogenea: Diclidophoridae)

Cited by 11 publications

References 9 publications

Efficacy of Orally Administered Febantel against Monogenean Heterobothrium okamotoi infection of Cultured Tiger Puffer Takifugu rubripes

Efficacy of Orally Administered Febantel against Monogenean Heterobothrium okamotoi infection of Cultured Tiger Puffer Takifugu rubripes

Egg-laying patterns and in vivo egg production in the monogenean parasites Heteraxine heterocerca and Benedenia seriolae from Japanese yellowtail Seriola quinqueradiata

Economic costs of protistan and metazoan parasites to global mariculture

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