Publications
USGS divers in the Elwha River
WFRC zebrafish laboratory
Processing a Lost River sucker
Below is a list of available WFRC peer reviewed and published science.
Filter Total Items: 2531
Studies on digenetic trematodes of the genera Gymnophallus and Parvatrema Studies on digenetic trematodes of the genera Gymnophallus and Parvatrema
No abstract available.
Authors
H. W. Stunkard, Joseph R. Uzmann
A possible cause of sunburn in fish A possible cause of sunburn in fish
A LESION DESCRIBED AS A GRAY ΡATCH GENERALLY LOCATED ΑΝΤΕRIOR TO THE DORSAL FIN has been associated with high mortality of fish on numerous occasions in production hatcheries throughout the United States. This lesion has been called "sunburn" or "backpeel." No bacteria or other pathogens have been found in fish with these symptoms. For example, at a Montana hatchery in April 1956...
Record of the fungus Ichthyosporidium Caullery and Mesnil, 1905, in Idaho Record of the fungus Ichthyosporidium Caullery and Mesnil, 1905, in Idaho
No abstract available.
Authors
A. John Ross, Thomas J. Parisot
Rapid counting of nematoda in salmon by peptic digestion Rapid counting of nematoda in salmon by peptic digestion
The nematode parasite Anisakis sp. can be recovered, relatively unaltered, from chum salmon musculature by high temperature (52°+2°C.) peptic digestion of the flesh. The procedure, which is presented in detail, appears to be more thorough in isolating the parasite than dissection of the flesh and manual isolation of the worms. In addition, the procedure is rapid, comparatively simple...
Authors
Joseph A. Stern, Diptiman Chakravarti, Joseph R. Uzmann, M. N. Hesselholt
Parasitological methods for identification and abundance estimates of downstream migrant races of salmon Parasitological methods for identification and abundance estimates of downstream migrant races of salmon
No abstract available
Authors
J. R. Uzmann, R.A. Lander, M. N. Hesselholt
Record of the parasitic copepod Lernaea cyprinacea L. in Oregon and Washington fishes Record of the parasitic copepod Lernaea cyprinacea L. in Oregon and Washington fishes
No abstract available.
Authors
J. R. Uzmann, H. J. Rayner
Teratological hermaphroditism in the chum salmon Oncorhynchus keta (Walbaum) Teratological hermaphroditism in the chum salmon Oncorhynchus keta (Walbaum)
The anomalous condition of hermaphroditism appears to be no less rare in fish than in other normally dioecious animals. Previous records of bisexuality' in the Pacific salmons, Oncorhynchus spp., are few in number despite the intensive study accorded this group. Rutter (1902) reported the condition in two king salmon (O. tshawytscha); Crawford (1927) reported the condition in a silver...
Authors
J. R. Uzmann, M. N. Hesselholt
Some problems of private trout hatchery operators Some problems of private trout hatchery operators
Disease, nutritional, and environmental problems in commercial production of trout are discussed, including mortality and age of spawners, copepod and gyrodactylid infections, suitable water temperatures, diseases (especially red mouth and back peel) and inspection of fish. It is concluded that experiences with hatchery procedures have varied greatly and often the commercial trout...
Authors
Robert R. Rucker
The nutrition of salmonid fishes. II. Studies on production diets The nutrition of salmonid fishes. II. Studies on production diets
In 69 production diets fed to hatchery salmonids, there was a wide variation in the ingredients of the diets and in their content of protein, fat, carbohydrate and ash. There was a close correlation between the body composition of hatchery-raised fish and the composition of the diets fed. The data indicated, however, that differences in hatchery management, such as level of feeding, were...
Authors
E. M. Wood, W. T. Yasutake, A.N. Woodall, J.E. Halver
New host and locality record for Triaenophorus crassus forel (Cestoda: pseudophyllidea) New host and locality record for Triaenophorus crassus forel (Cestoda: pseudophyllidea)
The adult form of Triaenophorus crassus Forel, 1868 (= T. robustus Olsson, 1893; = T. tricuspidatus morpha megadentatus Wardle, 1932) occurs as an intestinal parasite in the pike, Esox lucius L., a holarctic species of wide distribution. Preliminary life-history stages include procercoid development in copepods of the genus Cyclops followed by plerocercoid development in the musculature...
Authors
J. R. Uzmann, M. N. Hesselholt
Some myxosporidia found in Pacific Northwest salmonids Some myxosporidia found in Pacific Northwest salmonids
During the histological examination of a group of wild and hatchery salmonids undescribed sporazoans were frequently observed. This was not unexpected, since Myxosporidia are typical fish parasites (Kudo, 1920). Myxidium were observed in kidney tubules, Cholromyxum in glomeruli, and Myxobous in the spinal cord and on epidermal scales. The present paper will deal with the description and
Authors
W. T. Yasutake, E. M. Wood