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Full-Text Articles in Life Sciences
Columnaris Disease Of Fishes, G. L. Bullock, T. C. Hsu, E. B. Shotts Jr.
Columnaris Disease Of Fishes, G. L. Bullock, T. C. Hsu, E. B. Shotts Jr.
United States Fish and Wildlife: Staff Publications
Columnaris disease is an acute to chronic bacterial infection that affects anadromous salmonids and virtually all species of warmwater fishes. Davis (1922), who first described the disease, named it columnaris because the causal bacterial cells seen in wet mounts of affected gills and fins were arranged in columnar aggregations. Ordal and Rucker (1944) were the first to isolate the causal organism and, based on cellular morphology, identified it as a myxobacterium. Organisms classified in the order Myxobacterales are long, thin gram-negative rods that are motile on agar media by a creeping or flexing motion. They have a life cycle composed …
Proliferative Kidney Disease In Salmonid Fishes, R. P. Hendrick, M. L. Kent, C. E. Smith
Proliferative Kidney Disease In Salmonid Fishes, R. P. Hendrick, M. L. Kent, C. E. Smith
United States Fish and Wildlife: Staff Publications
Proliferative kidney disease (PKD) in salmonid fishes is caused by a poorly understood protozoan, the vegetative stages of which are known as PKX cells. The organism was initially believed to be an amoeba (phylum Sarcomastigophora) by Plehn (1924) and later by Ghittino et al. (1977) and Ferguson and Needham (1978). Similarities between PKX and oyster pathogens of the genus Marteilia led Seagrave et al. (1980) to suspect that the parasite was instead a haplosporidan (phylum Acetospora). More recent studies by Hedrick et al. (1984) and Kent and Hedrick (1985a,b) indicated that the PKX cells are pre sporogonic forms …
Biography Of Glenn L. Hoffman, R. M. Overstreet, F. P. Meyer
Biography Of Glenn L. Hoffman, R. M. Overstreet, F. P. Meyer
United States Fish and Wildlife: Staff Publications
In the fictional West of the United States, a masked man known only as the Lone Ranger rode into the lives of troubled individuals on his white stallion, Silver, and, with the aid of his trustworthy Indian sidekick, Tonto, and a six-shooter filled with silver bullets, solved the people's problems and protected them from villains. When the Lone Ranger finished his deed, he rode away and a person who had received help always asked someone nearby 'Who was that masked man, anyway?'
Channel Catfish Virus Disease, John A. Plumb
Channel Catfish Virus Disease, John A. Plumb
United States Fish and Wildlife: Staff Publications
Channel catfish virus disease (CCVD) is an acute infection of cultured fry and fingerling channel catfish (Ictalurus punctatus). The disease occurs primarily during summer and, with few exceptions, in fish less than 4 months old. The causative agent, the channel catfish virus (CCV), is a member of the herpesvirus group. Since its first identification (Fijan 1968), it has been isolated from infected fish in most areas of the United States where channel catfish are cultured.