Mortality of cultured Atlantic salmon, <i>Salmo salar</i> L., parr caused by an infection of <i>Ergasilus labracis</i> (Copepoda: Poecilostomatoida) in the lower Saint John River, New Brunswick, Canada

Hogans, W. E.

doi:10.1111/j.1365-2761.1989.tb00563.x

Cited by 13 publications

(16 citation statements)

References 3 publications

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“…They also suggest that an E. centrarchidarum-a freshwater ergasilid-recorded by Bere (1930) on the same host species in the Passamaquoddy region of New Brunswick was most likely E. labracis (Marques and Hogans 1996). In addition, repeated outbreaks of this parasite have occurred on parr-stage farmed Atlantic Salmon in the lower Saint John River, New Brunswick, and in one instance resulted in mass mortalities prior to treatment (Hogans 1989;O'Halloran et al 1992).…”

Section: Host Recordmentioning

confidence: 97%

“…Another possibility is sampling bias; previous studies of Ergasilus spp. largely report dissecting out the gills without Paperna andZwerner 1976b, 1982;Hogans 1989Hogans , 1991Dezfuli et al 2011;Kilian and Avenant-Oldewage 2013).…”

Section: Damage Inflicted To Hostmentioning

confidence: 99%

“…To date, the highest reported infection intensity of E. labracis on a wild fish involved an age-1 White Perch that had 2,757 individuals parasitizing its gills (Paperna and Zwerner 1976a). However, during an outbreak of E. labracis that killed several thousand parr-sized farmed Atlantic Salmon in only a few days, Hogans (1989) reported a prevalence of 100% and an intensity of 84.6 E. labracis per host; the highest number of parasitic copepods infesting a single fish was 2,229. Not only can the immediate pathological effects of parasitic copepod infestation be detrimental to hosts, heavily infected hosts are less likely to withstand environmental challenges such as oxygen depletion, algal blooms, and pollution (Paperna and Zwerner 1976b;Lafferty and Kuris 1999).…”

Section: Prevalence Of Ergasilus Labracis By Host Size and Healthmentioning

confidence: 99%

“…Many common food fishes are suitable hosts on which parasitic adult females can be found in abundance (Wilson 1911;Paperna and Zwerner 1976a;Hogans 1991). Thus, due to their low host specificity and tolerance of a broad range of environmental conditions, ergasilids pose a potential threat to both wild and farmed fish stocks (Johnson and Rogers 1973;Hogans 1989;Johnson et al 2004;Dezfuli et al 2011).…”

mentioning

confidence: 99%

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Occurrence of the Parasitic Copepod Ergasilus labracis on Threespine Sticklebacks from the South Coast of Newfoundland

2014

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A study conducted from August to October 2013 surveyed Threespine Sticklebacks Gasterosteus aculeatus (n = 822) for the presence of parasitic copepods in the vicinity of large sea-cage salmonid farms in Bay d'Espoir, Newfoundland. The majority of parasitic copepods surveyed were Ergasilus labracis (n = 4,684). Other parasitic copepods observed on Threespine Sticklebacks during the survey included chalimus-stage Lepeophtheirus spp. (n = 3), adult Argulus alosae (n = 2), and a single Thersitina gasterostei. This represents a new host record for E. labracis. The copepods were present on fish collected in a broad range of temperatures (6.9-17.7°C) and salinities (10.2-30.2 [Practical Salinity Scale]). The parasitic copepods were most commonly found on larger hosts estimated to be age 1 or older. Surprisingly, the highest infestations (approximately 65%) were found on regions of the hosts outside of the gills (behind the pectoral fins and pelvic spines); in some cases, the copepods had inflicted significant damage to the skin of their hosts. Among host fish with evidence of an additional infection, such as microsporidian tumors (xenomas) or hemorrhagic-like symptoms (dark red abdomens and bloody mucus), the prevalence of E. labracis was significantly higher (43.4%) than among healthy fish (28.9%) despite there being no significant difference in size between the two fish health groups. In contrast, intensity (mean number of individual parasites per host) was significantly higher among healthy hosts (23.6) than among unhealthy ones (7.63). Although this parasite has been listed as present in Newfoundland previously, it has a broad host range and has been reported to be pathogenic to farmed salmonids. Therefore, its potential impact on wild and farmed fish populations around Newfoundland should not be underestimated.

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Section: Host Recordmentioning

confidence: 97%

Section: Damage Inflicted To Hostmentioning

confidence: 99%

Section: Prevalence Of Ergasilus Labracis By Host Size and Healthmentioning

confidence: 99%

mentioning

confidence: 99%

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Occurrence of the Parasitic Copepod Ergasilus labracis on Threespine Sticklebacks from the South Coast of Newfoundland

2014

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“…Fish farms provide ideal conditions for transmission of infectious diseases, particularly those involving macroparasites with direct life cycles (Buchmann et al, 1987;Hogans, 1989).…”

Section: Introductionmentioning

confidence: 99%

Protozoan parasites of Xiphophorus spp. (Poeciliidae) and their relation with water characteristics

Garcia

Fujimoto

Martins

et al. 2009

Arq. Bras. Med. Vet. Zootec.

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This work investigated the relationship between water characteristics and infestation of protozoan parasites, Icthyophthirius multifiliis and Trichodina sp., in swordtails (Xiphophorus helleri) and platy (Xiphophorus maculates) collected in an ornamental fish farm in São Paulo, Brazil. Fish were monthly collected from ponds and tanks for one year. The prevalence rates in fish from tanks and ponds were, respectively, 34.2% and 22.5% for I. multifiliis, and 13% and 54.2% for Trichodina sp. Increased electric conductivity and pH provoked reduction of I. multifiliis infestation. Low oxygen concentration increased Trichodina sp. infestation. The use of salt to increase the electric conductivity of water was a method to control I. multifiliis. Low dissolved oxygen and the addition of organic fertilizer favored the reproduction of Trichodina sp.Keywords: swordtails, platy, parasite, protozoan, Trichodina sp., Icthyophthirius multifiliis RESUMO Investigou-se a relação entre as características da água e a infestação de protozoários parasitos,

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2010

Fish Disease

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Mortality of cultured Atlantic salmon, Salmo salar L., parr caused by an infection of Ergasilus labracis (Copepoda: Poecilostomatoida) in the lower Saint John River, New Brunswick, Canada

Cited by 13 publications

References 3 publications

Occurrence of the Parasitic Copepod Ergasilus labracis on Threespine Sticklebacks from the South Coast of Newfoundland

Occurrence of the Parasitic Copepod Ergasilus labracis on Threespine Sticklebacks from the South Coast of Newfoundland

Protozoan parasites of Xiphophorus spp. (Poeciliidae) and their relation with water characteristics

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