Graduate Thesis Or Dissertation
 

Epidermal tumors on juvenile English sole (Parophrys vetulus) from Yaquina Bay, Oregon

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  • Juvenile English sole (Parophrys vetulus) were collected in Yaquina Bay, Oregon from January, 1986 to March, 1987. Recruitment of young-of-the-year sole occurred from January to June, 1986 and again from December, 1986 to February, 1987. Emigration from Yaquina Bay started in September, 1986, but a small portion of the English sole population over-wintered in the estuary. Angioepithelial nodules, epidermal papillomas and plaque-like, spreading lesions were identified by their gross morphology. Epidermal tumors were present on 18.7 percent of the 1612 English sole captured and affected fish averaged 2.8 tumors each. Tumorous fish ranged in length from 28 to 130 mm and were collected each month. The larger, overwintering sole had a higher tumor prevalence than the bulk of the population. In histologic preparations, typical X-cells were present in all tumors examined. When present in angioepithelial nodules, X-cells were smaller than those found in epidermal papillomas. In 73 percent of the epidermal papillomas sectioned, numerous X-cells contained a single, basophilic, spherical nuclear inclusion. No virus particles were seen in X-cells, nuclear inclusions, or in other tissue components of epidermal papillomas when viewed with an electron microscope. Attempts to culture X-cells using primary tissue culture techniques or by inoculating malt-yeast-agar were unsuccessful. X-cell mitotic figures were not found in tissue cultures, histologic sections or tissue imprints. Laboratory observations of tumorous fish suggest a variable rate of tumor growth and some angioepithelial nodules develop into epidermal papillomas, while others disappear. The epidermis at the site where angioepithelial nodules were lost, healed completely and tumorous tissue did not reappear. Epidermal papillomas did not regress under laboratory conditions. Neither the etiology of epidermal tumors on English sole nor the nature of X-cells was determined in this study.
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