Seasonal development of the coccidian parasite Goussia bayae and hepatobiliary histopathology in white perch Morone americana from Chesapeake Bay

2019 ◽  
Vol 134 (2) ◽  
pp. 113-135 ◽  
Author(s):  
MA Matsche ◽  
VS Blazer ◽  
PM Mazik
Keyword(s):  
Chesapeake Bay ◽  
White Perch ◽  
Seasonal Development ◽  
Morone Americana ◽  
Coccidian Parasite

Mitochondrial DNA Analysis of Chesapeake Bay White Perch, Morone americana

Copeia ◽  
1989 ◽  
Vol 1989 (3) ◽  
pp. 679 ◽  
Author(s):  
Timothy J. Mulligan ◽  
Robert W. Chapman
Keyword(s):  
Mitochondrial Dna ◽  
Chesapeake Bay ◽  
Dna Analysis ◽  
White Perch ◽  
Morone Americana ◽  
Mitochondrial Dna Analysis

High prevalence of biliary neoplasia in white perch Morone americana: potential roles of bile duct parasites and environmental contaminants

2020 ◽  
Vol 141 ◽  
pp. 195-224
Author(s):  
MA Matsche ◽  
VS Blazer ◽  
EL Pulster ◽  
PM Mazik
Keyword(s):  
Bile Duct ◽  
Chesapeake Bay ◽  
White Perch ◽  
Biological Effects ◽  
Environmental Contaminants ◽  
Significant Risk ◽  
Chemical Exposure ◽  
Morone Americana ◽  
High Prevalence ◽  
River Fish

Recent surveys of white perch Morone americana from Chesapeake Bay, USA, revealed a high prevalence of hepatic and biliary lesions, including neoplasia, and bile duct parasites. Here, we describe lesions in the liver and gallbladder and evaluate for statistical associations among lesions, parasites, and biomarkers of chemical exposure in fish from 2 tributaries of Chesapeake Bay. Fish were collected from an estuarine site in the Choptank River (n = 122, ages 3-11), a tributary with extensive agriculture within the watershed, and the Severn River (n = 131, ages 2-16), a tributary with extensive urban development. Passive integrative samplers were deployed at the fish collection site and an upstream, non-tidal site in each river for 30 d. Intrahepatic biliary lesions observed in fish from both rivers included neoplasia (23.3%), dysplasia (16.2%), hyperplasia (46.6%), cholangitis (24.9%), and dilated ducts containing plasmodia of Myxidium sp. (24.9%). Hepatocellular lesions included foci of hepatocellular alteration (FHA, 15.8%) and neoplasia in 4 Severn River fish (2.3%). Age of fish and Myxidium sp. infections were significant risk factors for proliferative and neoplastic biliary lesions, age alone was a risk factor for FHA, and Goussia bayae infections were associated with cholangitis and cholecystitis. Lesion prevalence was higher in fish from the Severn River, which contained higher concentrations of PAHs, organochlorine pesticides, and brominated diphenyl ethers. Metabolite biomarkers indicated higher PAH exposures in Severn River fish. This study suggests Myxidium sp. as a promoter of bile duct tumors, but more data are needed to evaluate the biological effects of environmental contaminants in this species.

Nematodes in Fresh Market Fish of the Washington, D.C. Area

1978 ◽  
Vol 41 (8) ◽  
pp. 613-620 ◽  
Author(s):  
G. J. JACKSON ◽  
J. W. BIER ◽  
W. L. PAYNE ◽  
T. A. GERDING ◽  
W. G. KNOLLENBERG
Keyword(s):  
Chesapeake Bay ◽  
Marine Mammals ◽  
White Perch ◽  
Morone Americana ◽  
Intermediate Hosts ◽  
Fresh Market ◽  
Fish Flesh ◽  
Low Incidence ◽  
Fish Viscera ◽  
Raphidascaris Acus

For this study 1,010 fresh whole fish belonging to 14 families, 20 genera, and 23 species were bought in retail markets of the Washington, D.C. area. Most of the fish had been caught in Chesapeake Bay and adjacent waters. Examination for parasitic roundworms, i.e., nematodes, by dissection, candling or digestion of the flesh, and elution of nonedible viscera produced 6,547 nematodes, mostly alive. Among fish species of which 25 or more were examined, spotted hake (Urophycis regius) was the most wormy and white perch (Morone americana) the least. Only two of the nematodes were recovered from fish flesh; both were Anisakis sp. larvae. Recovered from fish viscera were nine Anisakis sp. larvae. 41 Porrocaecum sp. larvae, 3,221 Thynnascaris spp. larvae and adults, 21 Goezia sp. larvae, and 1,220 Raphidascaris acus larvae. All the aforementioned nematodes are considered to be anisakines; in addition, 225 anisakines were too damaged to be identified more precisely. The other nematodes recovered in the survey were 71 Spinitectus spp. adults and larvae, 114 Bulbodactinis sp. adults and larvae, 108 Metabronema sp. adults and larvae, 111 Spirurinae larvae, 662 Philometra sp. adults and larvae, one Capillaria sp. larva, 447 similar small larvae so undeveloped that they could not be identified, and 294 other nematodes too damaged even for general classification. Only the Anisakis sp. larvae are considered pathogenic to human consumers of raw or semiraw fish. The low incidence of pathogenic anisakines in these fish intermediate hosts is attributed to the absence of definitive hosts (marine mammals) from Chesapeake Bay and adjacent waters. Thirty genera of anisakine nematodes are distinguished morphologically.

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