The influence of different water temperatures on Neobenedenia girellae (Monogenea) infection, parasite growth, egg production and emerging second generation on amberjack Seriola dumerili (Carangidae) and the histopathological effect of this parasite on fish skin

Hirazawa, Noritaka; Takano, Ryoko; Hagiwara, Hiroko; Noguchi, M.; Narita, Minoru

doi:10.1016/j.aquaculture.2009.11.025

Cited by 64 publications

(41 citation statements)

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“…Biofouling obstructs meshes, thereby causing low water quality inside net cages and enhancing parasite dissemination. Th e water temperature observed in this marine fi sh farm probably favored both the development of biofouling and the reproduction and development of monogeneans (HIRAZAWA et al, 2010).Despite severe parasitism, only one fi sh died due to extreme debilitation, while one other fi sh was found in the necropsy to have become severely weakened. In the laboratory, after immersion in freshwater, no parasite could be found in the fi sh.…”

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“…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.…”

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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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confidence: 99%

Section: Introductionmentioning

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confidence: 99%

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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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“…The host-parasite relationship is little studied and the monogeneans have different strategies of attachment on the hosts as well as their reproductive mechanisms, in which they may influence on their pathogenicity. Studies demonstrated that monogenean infestation have caused epithelial (Hirazawa et al, 2010), gill (Del Rio-Zaragoza et al, 2010) and hematological alterations (Tavares-Dias et al, 2008;Araújo et al, 2009;Del Rio-Zaragoza et al, 2010), consequently favoring secondary infections (Xu et al, 2007).…”

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confidence: 99%

Haematological and histopathological analysis in South American fish Piaractus mesopotamicus parasitized by monogenean (Dactylogyridae)

Jerônimo

Pádua²,

Bampi

et al. 2014

Braz. J. Biol.

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Monogeneans are the parasites mostly found on the body surface and gills of fish and can cause large losses in farmed fish. Some studies demonstrate elevated parasitic levels causing hematological alterations. But few of them relate the effects of parasitism on the hematology and histopathology of native freshwater farmed fish. This study evaluated the host-parasite relationship in pacu (Piaractus mesopotamicus) parasitized by the monogenean Anacanthorus penilabiatus. Hematological and parasitological assessments were obtained in 60 fish captured in a fish farm located in Dourados, State of Mato Grosso do Sul, Central Brazil. Fish were analyzed in different categories of parasite number: class I (n=13; 0-200 parasites), class II (n=17; 201-1200 parasites); class III (n=7; 1201-2200 parasites); and class IV (n=23; more than 2200 parasites per host). The highest levels of parasitism caused significant decrease (p<0.05) in the hematocrit, red blood cells (RBC), mean hemoglobin concentration (MCHC) and basophils number. Thrombocytes, mean corpuscular volume (MCV), mean corpuscular hemoglobin concentration (MCHC), monocytes, eosinophils, neutrophils and LG-PAS did not present significant difference among the parasitic levels. In contrast, increased number of total leukocytes and lymphocytes were found in highly-parasitized fish. A positive linear correlation (p<0.01) was found between the amount of parasites and fish weight. Histopathology revealed severe hyperplasia, sub-epithelial edema, fusion of the secondary lamellae, focal and multifocal necrosis in highly parasitized fish.Keywords: Pacu, fish farm, parasitism, haematology, histology. Análises hematológica e histopatológica no peixe sul-americano

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“…Water temperature and salinity favored the reproduction and development of monogeneans (HIRAZAWA et al, 2010). In spite of the low specificity of N. melleni, recent studies show that some fish species have higher resistance to this parasite.…”

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First record of Neobenedenia “melleni” – like species (Monogenea: Capsalidae) in Goliath grouper Epinephelus itajara in Brazil

Silva

Leite

Hostim‐Silva

et al. 2014

Rev. Bras. Parasitol. Vet.

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The influence of different water temperatures on Neobenedenia girellae (Monogenea) infection, parasite growth, egg production and emerging second generation on amberjack Seriola dumerili (Carangidae) and the histopathological effect of this parasite on fish skin

Cited by 64 publications

References 15 publications

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

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

Haematological and histopathological analysis in South American fish Piaractus mesopotamicus parasitized by monogenean (Dactylogyridae)

First record of Neobenedenia “melleni” – like species (Monogenea: Capsalidae) in Goliath grouper Epinephelus itajara in Brazil

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