Search USGS⌕ Search

Geology topics

T. J. Parisot

Publications and source records attributed to T. J. Parisot.

12 recordsLinked to original sources
USGS2006

Virus diseases of salmonidae in the western United States. II. Aspects of pathogenesis

During the 10 to 15 years investigators from Europe and eastern United States have reported fish diseases of virus etiology. Rucker et al. in 1953 were the first to report a disease of possible virus origin in fish in the western United States. Since then many workers in the western states have described various epizootics caused by transmissible and filterable agents. The etiology and pathology of epizootics reported to date have been three viral diseases: (1) specific for sockeye salmon (Onchorhynchus nerka), (2) specific for chinook salmon (O. tshawytacha); and (3) isolated from rainbow trout (Salmo gairdneri). brook trout (Salvalinus fontinalis). and cutthroat trout ( Salmo clarkii). The most recent historical, etiological and morphological study of diseases of viral and possible viral origin occurring the West has been reported in detail by Parisot et al. With the exception of two investigations, histopathological accounts have been brief and cursory and, to date, pathogenesos of these viral diseases have not been recorded. This study was undertaken to initiate a series concerning pathogeneses of infectious diseases of salmonids. The two viral diseases covered in this paper are the Oregon sockeye disease (OSD) and Sacramento River chinook disease (SRCD). Some preliminary data on pathology of the corresponding material from the hatchery epizootics will also be described and discussed.

Annals of the New York Academy of Sciences↗
USGS2006

Virus diseases of the salmonidae in the western United States. III. Immunopathological aspects

The immune response among fish, from a phylogenetic standpoint, presents a progressive pattern of increasing development. The cyclostomes have been shown to have only feeble immunologic responsiveness. One of their number, the hagfish, appeared to be totally lacking in the ability to actively acquire antibodies. Among the elasmobranchs, the sharks have received the most study immunologically. This group demonstrated a variable response to antigenic stimulation Of the teleosts, the salmonids and the cyprinids have been the more frequent recipients of experimentally introduced antigens. These fishes, as well as other species of teleosts, are quite active and quite consistent in their response to various antigens.

Annals of the New York Academy of Sciences↗
USGS1963

A new geographic and host record for infectious pancreatic necrosis

The occurrence of infectious pancreatic necrosis in rainbow trout (Salmo gairdneri), brook trout (Salvelinus fontinalis), and cutthroat trout (Salmo clarki) has been experimentally authenticated for the first time in the western United States. The cutthroat trout represents a new host. Brook trout fin tissue culture inoculated with bacteria-free filtrate from the diseased fish tissue showed marked degenerative changes after 24 hours. Chinook salmon (Oncorhynchus tshawytscha), kokanee (O. nerka), and silver salmon (O. kisutch) were not susceptible to the virus when inoculated. Histologically, extensive pancreatic necrosis was observed in the original and experimental materials, but striated muscle hyalinization was detected only in the original material.

Transactions of the American Fisheries Society↗
USGS1962

An interim report on Sacramento River Chinook disease: A virus-like disease of Chinook salmon

An annually recurring disease among chinook salmмом ( Oncorhynchus tahawytscha ) FINGERLINGs at the National Fish Hatchery at Coleman, California, was reported by Ross, Pelnar, and Rucker (1960). They presented results of experimental investigation of the disease which established that the etiologic agent was filterable, highly virulent, and resistant to antibiotics and some of the more common chemicals, and that it was apparently not transmitted in salmon product-used as food, as was shown for a virus disease of sockeye salmon ( O. merka ) by Guenther, watson, and Rucker (T559). Also, Ross and his co-workers (1960) indicated a relation between temperature and incidence of the disease, and speculated on the possibility of the agent's being a virus.

Progressive Fish-Culturist↗
USGS1959

Fish mycobacteriosis (Tuberculosis)

The etiologic agent for the bacterial disease, "fish tuberculosis" (more correctly "mycobacteriosis"), was first observed in carp in 189& from a pond in France. Subsequently similar agents have been isolated from or observed in fish in fresh water, salt water, and brackish water, in fish in aquaria, hatcheries, and natural habitat~ (wild populations of fish). The disease has been recognized as an important infection among hatchery reared salmonid fishes on the West Coast of the United States, and in aquarium fishes such as the neon tetra, the Siamese fighting fish, and in salt water fish held in zoological displays.

Fishery Leaflet↗