Prevalence, intensity and pathology of the nasal parasite Nasicola hogansi in Atlantic bluefin tuna ( Thunnus thynnus )
| Autor: | Wolfgang K. Vogelbein, Molly Lutcavage, Stephen A. Bullard, Emily Chandler, Zoemma T. Warshafsky |
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| Rok vydání: | 2020 |
| Předmět: |
0301 basic medicine
Pathology medicine.medical_specialty Veterinary (miscellaneous) Trematode Infections Aquatic Science Biology Fish measurement Fish Diseases 03 medical and health sciences Sex Factors New England Prevalence medicine Animals Body Size Parasite hosting Atlantic Ocean Predator Population Density Tuna 04 agricultural and veterinary sciences biology.organism_classification Nasal epithelium Capsalidae 030104 developmental biology 040102 fisheries 0401 agriculture forestry and fisheries Seasons Trematoda human activities Thunnus Body condition |
| Zdroj: | Journal of Fish Diseases. 43:327-335 |
| ISSN: | 1365-2761 0140-7775 |
| Popis: | Ectoparasitic flatworms of Nasicola (Monogenoidea: Capsalidae), which infect nasal epithelium of true tunas (Thunnus spp.), are not well studied, nor have their impacts on the host's olfactory organ been evaluated. Infections of Nasicola hogansi on Atlantic bluefin tuna, Thunnus thynnus, were investigated with emphasis on the relationship between infection prevalence, abundance and mean intensity with bluefin tuna size, sex, body condition and capture month, as well as histopathological effects. Commercially caught Atlantic bluefin tuna (n = 161, 185-305 cm curved fork length) from the Gulf of Maine were sampled during June through August 2009 for infections by N. hogansi. A total of 247 specimens of N. hogansi were collected, with a prevalence of 45.3%, mean abundance of 1.57 (CI: 1.21-2.03) and mean intensity of 3.45 (CI: 2.91-4.22). Neither fish sex nor landing month had a significant effect on parasite parameters. Larger and better-conditioned Atlantic bluefin tuna had a higher mean intensity of infection. Pathology associated with infection by N. hogansi included extensive necrosis, sloughing of the nasal epithelium and associated inflammation of underlying connective tissues. Further epidemiological and pathological study of this host-parasite system is warranted since impaired olfaction, if present, could adversely affect spawning and migration of this top ocean predator. |
| Databáze: | OpenAIRE |
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