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Wide spread presence of calcareous bodies attached to the gills of largemouth bass (Micropterus salmoides) in Higgins Lake, Michigan

Abstract:

Heavy infection with glochidia was noticed in the gills of largemouth bass in Higgins Lake, Michigan.

Keywords: Largemouth bass, Higgins Lake, glocidia

 

 

Mortality outbreak in the Freshwater Drum Aplodinotus grunniens in Lake St. Clair, MI

Abstract:

Freshwater drum is an important component in the fisheries of the Great Lakes. A case was presented with lethargic freshwater drum exhibiting multiple hemorrhagic lesions in the branchial chamber. It was found that these lesions are caused by the hematophagous leech Actinobdella pediculate.

Keywords: freshwater drum, Lake St. Clair, leech,Actinobdella pediculate

 

Ascites syndrome in motorbike frog (Litoria moorei) tadpoles.

The reason for ascites in tadpoles were investigated. Grossly, there was fluid accumulation in the subcutaneous lymphatics and coelomic cavity and these were confirmed microscopically. Other changes include diffuse hypertrophic branchiopathy, dilated cardiomyopathy, and hepatocellular atrophy and sinudoidal distension. The pathogenesis is thought to be similar to ascites syndrome in meat poultry.

(Part 2) Recurrent Mortality Episodes in Two Captive Lake Trout (Salvelinus namaycush) Stocks in Michigan

Lake trout fingerlings in Marquette State Fish Hatchery, MI, suffered several epizootics of mortalities associated with skin lesions. Flavobacterium psychrophilum was isolated from these skin lesions and was found sensitive to florfenicol. However, treatment with chloramine-T and florfenicol did not remediate the increased mortalities, resulting in the loss of one hundred thousand lake trout fingerlings. Affected skin and cornea were damaged while the gills exhibited both lamellae edema and hyperplasia. Renal tubules were degenerated and Bowman space filled with proteinaceous material. Additional molecular testing revealed a high prevalence of the Epizootic Epitheliotropic disease Virus. Depopulation and heightened biosecurity measures were recommended. 

Recurrent Mortality Episodes in Two Captive Lake Trout (Salvelinus namaycush) Stocks in Michigan

Lake trout is an important component in the fisheries of the Great Lakes. Its rehabilitation program is built upon propagating selected lake trout stocks in state and federal hatcheries and stocking healthy fingerlings into designated water bodies in the Great Lakes basin. Lake trout fingerlings in the Marquette State Fish Hatchery suffered several epizootics of mortalities associated with lethargy, external lesions in the eyes, skin, and fins, and raised areas of skin with the absence of coloration. Flavobacterium psychrophilum was isolated from these skin lesions and was found sensitive to florfenicol. However, treatment with chloramine-T and florfenicol did not remediate the increased mortalities, resulting in the loss of one hundred thousand lake trout fingerlings. Your help is sought to solve this puzzle.