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Malignant melanoma of Brown Bullhead (Ameiurus nebulosus) in Lake Memphremagog, Vermont/Quebec

November 13, 2019

In 2012, brown bullhead (Ameiurus nebulosus) with large, raised, black growths were first reported from multiple areas within the Vermont portion of Lake Memphremagog. Subsequent surveys conducted from 2014 to 2017 at two sites within the lake indicated a prevalence of 30% in adult brown bullhead 200 mm and above total length. These lesions ranged from slightly raised smooth black areas to large nodular areas on the body surface and fins and within the oral cavity. Microscopically, these lesions were determined to be malignant melanoma with invasion into surrounding hypodermis, skeletal muscle and bone as well as metastases to gill, ovary and intestine. Liver neoplasms were also observed in 8% of the bullhead collected from Lake Memphremagog in 2015. Neither skin nor liver neoplasms were noted in Ticklenaked Pond, a site used for comparison.

Citation Information

Publication Year 2020
Title Malignant melanoma of Brown Bullhead (Ameiurus nebulosus) in Lake Memphremagog, Vermont/Quebec
DOI 10.1111/jfd.13112
Authors Vicki S. Blazer, Cassidy H. Shaw, Cheyenne R. Smith, P Emerson, Thomas R. Jones
Publication Type Article
Publication Subtype Journal Article
Series Title Journal of Fish Diseases
Series Number
Index ID 70206728
Record Source USGS Publications Warehouse
USGS Organization Leetown Science Center

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