Monogenea (platyhelminthes) as hazards for fish in confinement

Thoney, Dennis A.; Hargis, William J.

doi:10.1016/0959-8030(91)90027-h

Cited by 187 publications

(134 citation statements)

References 72 publications

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“…In a short time, an initial low infestation may turn into a severe infestation which has to be treated (see for example SCHÀPERCLAUS, 1991;THONEY et HARGIS Jr., 1991;SANTAMARINA et al. 1991: SCHMAL, 1991: TOJO et al, 1992.…”

Section: Gyrodactylus and Gyrodactylosis In Salmonid Farmsmentioning

confidence: 99%

Gyrodactylidae et Gyrodactylose des Salmonidae

Malmberg

1993

Bull. Fr. Pêche Piscic.

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Section: Gyrodactylus and Gyrodactylosis In Salmonid Farmsmentioning

confidence: 99%

Gyrodactylidae et Gyrodactylose des Salmonidae

Malmberg

1993

Bull. Fr. Pêche Piscic.

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“…This parasite has been found in many species of ornamental marine fish and sea farming in different countries, thus demonstrating its low specificity to the hosts (BULLARD et al, 2003). In Brazil, Sanches and Vianna (2007) Capsalid monogeneans have a monoxenic, short life cycle, which allows epizootic outbreaks especially in hosts subjected to high stocking densities (THONEY; HARGIS JUNIOR, 1991). It has been demonstrated that water temperature influences the growth, maturity, egg production and infestation levels of Neobenedenia species (HIRAZAWA et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

First record of Neobenedenia melleni (Monogenea: Capsalidae) in sea-farmed cobia (Rachycentron canadum) in Brazil

Kerber

Sanches

Santiago

et al. 2011

Rev. Bras. Parasitol. Vet.

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Neobenedenia melleni (MacCallum, 1927) (Monogenea) is a widespread pathogen in marine teleost cultures all over the world. The present paper reports this parasite species in farmed cobia (Rachycentron canadum) in Brazil, for the first time. Some comments on preventive actions for avoiding the disease are made.Keywords: Mariculture, pathogens, ectoparasites. ResumoNeobenedenia melleni (MacCallum, 1927) (Monogenea) é um patógeno amplamente distribuído em cultivo de teleósteos marinhos no mundo. Este estudo relata pela primeira vez essa espécie de parasito em cultivo de cobia, Rachycentron canadum, no Brasil. Comentários sobre prevenção para evitar a doença são discutidos.Palavras-chave: Maricultura, patógenos, ectoparasitos.Research relating to sea-farmed cobia (Rachycentron canadum Linnaeus, 1766) has been increasing recently. The great growth potential of cobia, their easy adaptability and ability to breed in captivity, excellent meat quality and carcass utilization, among other attributes, have induced rapid growth of cobia farming all over the world (CHANG et al., 2007). However, one of the main limitations affecting cobia culture is the diseases caused by helminth ectoparasites (monogeneans) (LIAO et al., 2004), especially Neobenedenia species (OGAWA et al., 2006).Infestations by ectoparasites in farmed fish have been recorded since the late 1950s (OGAWA et al., 1995). Deveney et al. (2001) described an outbreak of Neobenedenia elleni (MacCallum, 1927) parasitizing Lates calcarifer in Australian waters that resulted in the loss of 200,000 fish due to secondary infection. This parasite has been found in many species of ornamental marine fish and sea farming in different countries, thus demonstrating its low specificity to the hosts (BULLARD et al., 2003). In Brazil, Sanches and Vianna (2007) Capsalid monogeneans have a monoxenic, short life cycle, which allows epizootic outbreaks especially in hosts subjected to high stocking densities (THONEY; HARGIS JUNIOR, 1991). It has been demonstrated that water temperature influences the growth, maturity, egg production and infestation levels of Neobenedenia species (HIRAZAWA et al., 2010). These parasites feeds on mucus and epithelial cells of the host, which leads to changes in fish behavior: they drag their bodies against a substrate, such as net cages, thereby causing injuries culminating in secondary infections. Parasitized fish presents lesions in the cornea and skin, blindness, weakness, loss of appetite, hemorrhage, mucus hypersecretion and death due to secondary infections (OGAWA et al., 1995;HIRAYAMA et al., 2009). Our purpose in this paper was to document the first occurrence of capsalid monogeneans in cobia (R. canadum) farmed in Brazil. We have also suggested procedures that can be adopted for disease prevention.Ten juvenile specimens of R. canadum, with mean weight 317 ± 155 g, coming from floating net cages of a marine farm in Ilhabela, São Paulo, Brazil, were sent to our laboratory in March 2010, for diagnostic purposes. The fish were stocked ...

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“…In severe infections, Dactylogyrus can cause hemorrhaging and metaplasia of the gills which can lead to secondary bacterial infections and death (Thoney and Hargis 1991). In the present study increased MDA and decreased total thiol levels were observed in the gill tissues of goldfishes parasitized with Dactylogyrus spp.…”

Section: Discussionmentioning

confidence: 50%

“…Infection causes thickening of the gill epithelium that impairs respiratory function, negatively affects growth and can even cause death, especially in small carps (Thoney and Hargis 1991). Parasites with a direct life cycle, such as monogeneans, can reach epizootic levels very quickly when hosts and parasites are confined close together (Blazek et al 2008;Borji et al 2012).…”

Section: Introductionmentioning

confidence: 99%

Oxidative stress in the gill tissues of goldfishes (Carassius auratus) parasitized by Dactylogyrus spp

Mozhdeganloo

Heidarpour

2013

J Parasit Dis

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The aim of this study was to investigate the status of oxidative stress in the gill tissues of goldfishes (Carassius auratus) parasitized by Dactylogyrus spp. We therefore compared the concentrations of malondialdehyde (MDA) and total thiol groups in the gill tissues of parasitized and non-parasitized goldfishes. 15 goldfishes parasitized by Dactylogyrus spp. along with 15 nonparasitized goldfishes were selected for the study. A significant increase in MDA concentration (P \ 0.01) and a significant decrease in total thiol groups in the parasitized group, were observed when compared to the non-parasitized group. This is the first study which evaluates the effect of Dactylogyrus spp. on the oxidative stress status of goldfish. The results of the present study revealed that parasitized goldfishes showed more severe oxidative stress and lipid peroxidation than non-parasitized fishes and enhanced lipid peroxidation may be linked to gill damage in goldfishes parasitized by Dactylogyrus spp.

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Monogenea (platyhelminthes) as hazards for fish in confinement

Cited by 187 publications

References 72 publications

Gyrodactylidae et Gyrodactylose des Salmonidae

Gyrodactylidae et Gyrodactylose des Salmonidae

First record of Neobenedenia melleni (Monogenea: Capsalidae) in sea-farmed cobia (Rachycentron canadum) in Brazil

Oxidative stress in the gill tissues of goldfishes (Carassius auratus) parasitized by Dactylogyrus spp

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