“Gill Disease” of Portuguese Oysters

Proliferative Gill Disease (Hamburger Disease)

has become common in farmraised channel catfish. It can kill a few dozen fish over several days, or up to 100 percent of the fish in less than 3 days. Recurrence in the same pond is rare. From 1991 to 1995 PGD was the fourth most commonly diagnosed disease of catfish in the southeastern U. S., occurring in one out of every ten disease cases. This disease causes catfish to suffocate because of t...

Bacterial Gill Disease

Bacterial gill disease (BGD) is a common external infection of hatcheryreared salmonids and occasionally of warm water species reared under intensive conditions. As defined by Wood (1974), the name of the disease describes the clinical signs of bacterial infections on the gills. The etiological agent of the disease is considered to be one or more species of filamentous bacteria including Flavob...

Bacterial Gill Disease of Freshwater Fishes

Bacterial Gill Disease of Freshwater Fishes

Factors influencing disease-induced mortality of Pacific oysters Crassostrea gigas

Mortalities of oyster Crassostrea gigas seed associated with ostreid herpesvirus OsHV-1 μVar have been observed in many oyster-producing countries since 2008. The present study, comprised of 4 complementary experiments, aimed to identify factors associated with disease-induced oyster mortality in order to propose mitigation strategies. Our first experiment compared survival of oysters from natu...