Parasites and Associated Pathology Observed in Cetaceans Stranded Along the Oregon Coast

Dailey, Murray D.; Stroud, Richard K.

doi:10.7589/0090-3558-14.4.503

Cited by 77 publications

(70 citation statements)

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“…in mammals (Young & Lowe 1969) and also in humans (Ruitenberg 1970, Germano & Germano 1998. Cross sections of nematodes were found in the necrotic granulomas characterized by central areas of degenerating eosinophils that were surrounded by a wide zone of epithelioid granulation tissue followed by fibrous tissue which, according to Dailey & Stroud (1978), are characteristics of this infection. The main role of granulomatous reaction is that of defending the host against persistent irritants (Ringler 1997).…”

Section: Discussionmentioning

confidence: 99%

Gastric lesions associated with the presence of Anisakis spp. Dujardin, 1845 (Nematoda: Anisakidae) in Cetaceans stranded on the coast of Ceara, Brazil

et al. 2008

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IÑIGUEZ, A.M. 2008. Gastric lesions associated with the presence of Anisakis spp. Dujardin, 1845 (Nematoda: Anisakidae) in Cetaceans stranded on the coast of Ceara, Brazil. Biota Neotrop. 8(2): http://www.biotaneotropica.org.br/ v8n2/en/abstract?article+bn01608022008. Abstract:The gastric compartments of ten cetaceans stranded on the coast of Ceará State, Northeast Brazil were analyzed in this study. Gastric Anisakis spp. was diagnosed in all individuals involved in this study. Parasites and tissue samples were collected during necropsy. The presence of Anisakis parasites showed similar distribution across the three gastric compartments and the majority was free within the gastric lumen. Macroscopically, the lesions were predominantly characterized by the presence of ulcers (60%, 6/10) within the gastric mucosa, occasionally associated with edema and hemorrhage (30%, 3/10). Eight cetaceans (8/10 -80%) presented gastric microscopic alterations and in 75% (6/8) of these animals, chronic lymphoplasmocytic gastritis was observed with varying degrees of distribution and severity. Additionally, eosinophilic and granulomatous inflammation with giant cells, hemosiderosis, fibrosis and areas of necrosis were associated with location of parasites within the gastric mucosa. In this study, it was shown that the majority of cetaceans with the presence of Anisakis parasites presented macro and microscopic gastric alterations. These nematodes are probably associated with the development of these alterations; however, more pathological approaches are still required. Resumo: Neste estudo, foram analisados os compartimentos gástricos de dez cetáceos encalhados na costa do Ceará, região nordeste do Brasil. Parasitos do gênero Anisakis foram diagnosticados em todos os indivíduos estudados. As amostras parasitárias e teciduais foram coletadas durante o procedimento de necropsia. A presença de Anisakis demonstrou distribuição similar nos três compartimentos gástricos, estando a maior parte dos parasitos livre na mucosa gástrica. Macroscopicamente, as lesões se caracterizaram principalmente pela presença de úlceras (60%, 6/10) gástricas, associadas ocasionalmente a edema e hemorragia (30%, 3/10). Oito cetáceos (8/10 -80%) apresentaram alterações gástricas microscópicas e em 75% (6/8) destes animais, foi observada uma gastrite crônica linfoplasmocitária com vários graus de distribuição e severidade. Foram constatados ainda, focos de inflamação granulomatosa com a presença de eosinófilos, células gigantes e a formação de hemossiderose, fibrose e de necrose em torno dos parasitos. Neste estudo, a maioria dos cetáceos com a presença de parasitos do gênero Anisakis apresentaram alterações gástricas macro e microscópicas. Estes nematóides estão provavelmente associados ao desenvolvimento destas alterações, entretanto, mais estudos são ainda necessários. Palavras-chave: Anisakis sp, nematóides, úlceras, patologia, mamíferos marinhos, cetáceos, encalhe. 92 Motta, M.R.A. et al.

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Section: Discussionmentioning

confidence: 99%

Gastric lesions associated with the presence of Anisakis spp. Dujardin, 1845 (Nematoda: Anisakidae) in Cetaceans stranded on the coast of Ceara, Brazil

et al. 2008

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“…Few specimens of Risso's dolphin have been available for parasitological analysis because of the offshore habits of this species and the rarity of mass strandings and captures in whaling operations (Baird 2002). The limited information about gastrointestinal helminths comes from samples of 1 to 3 dolphins stranded mainly in the North Atlantic and North Pacific (Zam et al 1971, Dailey & Stroud 1978, Shults et al 1982, Kikuchi et al 1988, Abollo et al 1998, Mignucci-Giannoni et al 1998. In this study we present new data on the helminth fauna of the liver, pancreas, and gastrointestinal tract of 17 Risso's dolphins collected in the Western Mediterranean over the last decades.…”

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confidence: 89%

Gastrointestinal helminths of Risso's dolphin Grampus griseus from the Western Mediterranean

Fernández¹,

Agusti²,

Aznar³

et al. 2003

Dis. Aquat. Org.

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“…Every year, a number of whales strand along the migration route, yet the cause of death is rarely determined due to logistical difficulties. The role of parasitic disease as a factor in cetacean strandings is speculative (Dailey & Stroud 1978, Dailey & Walker 1978, Geraci 1978. During 1998, there was a relative increase in the number of dead gray whales observed along the migration route from Mexico to Alaska (Rowles 1999).…”

Section: Introductionmentioning

confidence: 99%

Prey, parasites and pathology associated with the mortality of a juvenile gray whale (Eschrichtius robustus) stranded along the northern California coast

Dailey¹,

Gulland²,

Lowenstine³

et al. 2000

Dis. Aquat. Org.

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An eastern Pacific gray whale (Eschrichtius robustus) stranded off Pelican Point, Tomales Bay, California, USA, was examined for physiological parameters, prey, parasites and associated pathology. The whale was emaciated, and hematological examination revealed an elevation in hematocrit, serum sodium, potassium, electrolyte values and hypoglycemia. Parasites recovered included 5 species, 1 ectoparasite (Cyamus scammoni ), and 4 helminths (Anisakis simplex, Ogmogaster antarcticus, Ogmogaster pentalineatus, Bolbosoma balanae) with the latter causing multifocal transmural abscesses. Histological examination indicated severe acute lung congestion, minimal, multifocal, lymphocytic, interstitial myocarditis, and mild hepatocellular and Kupffer cell hemosiderosis. The prey taxa present in the stomach indicated the whale was feeding on hard bottom communities prior to death.

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Parasites and Associated Pathology Observed in Cetaceans Stranded Along the Oregon Coast

Abstract: Ten stranded cetaceans, representing five species, from the Oregon Coast were examined between 1973-1977. Fourteen genera of parasites, together with the pathogenesis and pathology associated with the presence of some of these parasites are reported.

Cited by 77 publications

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Gastric lesions associated with the presence of Anisakis spp. Dujardin, 1845 (Nematoda: Anisakidae) in Cetaceans stranded on the coast of Ceara, Brazil

Gastric lesions associated with the presence of Anisakis spp. Dujardin, 1845 (Nematoda: Anisakidae) in Cetaceans stranded on the coast of Ceara, Brazil

Gastrointestinal helminths of Risso's dolphin Grampus griseus from the Western Mediterranean

Prey, parasites and pathology associated with the mortality of a juvenile gray whale (Eschrichtius robustus) stranded along the northern California coast

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