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The toxic dinoflagellate Pfiesteria piscicida Steidinger & Burkholder has recently been implicated as the etiologic agent of acute mass mortalities and skin ulcers in menhaden, Brevoortia tyrannus, and other fishes from mid-Atlantic U.S. estuaries. However, evidence for this association is largely circumstantial and controversial. We exposed tilapia(More)
The renal lesions of five species of estuarine fishes from the heavily polluted Elizabeth River, Virginia, and the nearby, less polluted Nansemond River were studied grossly and microscopically. No gross lesions were observed but microscopic lesions occurred in renal tissue. Mesangial sclerosis occurred in hogchoker, and mesangiolysis occurred in both(More)
Epithelial hyperplasia was the most distinctive pathological change in gill filaments of striped bass, Morone saxatilis (Walbaum), from the lower Chesapeake Bay infested by Ergasilus labracis Krøyer. This tissue reaction initiated in the filament area most adjacent to the mouth of the attached parasite. Interruption of parasite egg sac production and(More)
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