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  • 1
    ISSN: 1365-2761
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: Winter flounder, Pseudopleuronectes americanus, caught in Passamaquoddy Bay, New Brunswick, Canada, and held captive under crowded conditions, developed mixed infections of Trichodina murmanica Polyanski, 1955 (Ciliophora) and Gyrodactylus pleuronecti Cone, 1981 (Monogenea). A protocol involving sequential sieving was used to separate the two species of parasites and produce viable experimental baths. Replicate groups of juvenile, hatchery-reared flounder received one of the following treatments: mixed bath of G. pleuronecti and T. murmanica, bath of G. pleuronecti, bath of T. murmanica or parasite-free (controls). The abundance of both parasites correlated negatively with condition factor of the flounder (r=−0.354, P 〈 0.001 for Trichodina; r=–0.205, P 〈 0.05 for Gyrodactylus). During the periods of peak parasite abundance (1–2 weeks postinfection), the effect of the two parasite species was additive, as mean condition factor and the percentage change in weight were significantly lower (ANOVA, P 〈 0.05) among fish with mixed infections compared to single infections or controls. The most common signs of tissue pathology were increased density of epidermal mucous cells on the fins and macrovesicular lipidosis of the hepatocytes. After a significant decline in parasite infrapopulations (3 weeks postinfection), infected fish resumed normal growth, indicating the observed effects were somewhat reversible.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Bulletin of environmental contamination and toxicology 58 (1997), S. 442 -447 
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Archives of environmental contamination and toxicology 26 (1994), S. 491-496 
    ISSN: 1432-0703
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Notes: Abstract This study investigated anomalies in two species of benthic sculpins (Myoxocephalus octodecemspinosus and M. scorpius) inhabiting a marine inlet in Newfoundland, Canada, where effluent from a pulp and paper mill is discharged and from two reference sites. Condition factor of both species of sculpins from the polluted and a reference site was similar. Some differences in parasite fauna were observed. Tissues from reference fish, obtained from two uncontaminated sites for comparison, were normal. Impaired vision, fin and tail necrosis, hyperplasia of the gill epithelium, depletion of energy reserves in the liver, and multifocal hemosiderosis in the spleen were observed primarily in M. octodecemspinosus captured near the paper mill. These stress-associated lesions, probably caused by undetermined xenobiotics, appear to be associated with the sediment.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Archives of environmental contamination and toxicology 26 (1994), S. 95-102 
    ISSN: 1432-0703
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Notes: Abstract Winter flounder were captured by scuba divers from an area adjacent to a sulfite pulp and paper mill and from a reference site and the tissues examined for lesions. Severe hyperplasia of the gills, focal vacuolation in the liver, and multifocal hemosiderosis in the spleen and liver were most pronounced in large, adult fish collected near the mill. Lesions were less severe and prevalent in smaller fish. Vacuolation in the liver represents a preneoplastic lesion. The histopathological changes appear to be the result of chronic exposure. Few or no lesions were observed in the tissues of flounder taken from the reference site. Although the specific cause of these lesions is unknown, it is likely associated with cytotoxic compounds.
    Type of Medium: Electronic Resource
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