Publications
This list of publications includes peer-review journal articles, official USGS publications series, reports and more authored by scientists in the Ecosystems Mission Area. A database of all USGS publications, with advanced search features, can be accessed at the USGS Publications Warehouse.
Filter Total Items: 41758
Three-year investigation of mosquito breeding in natural and impounded tidal marshes in Delaware
No abstract available.
Authors
R.F. Darsie, P. F. Springer
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 indentific
Authors
W. T. Yasutake, E. M. Wood
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 salmon (O. k
Authors
J. R. Uzmann, M. N. Hesselholt
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 of a varie
Authors
J. R. Uzmann, M. N. Hesselholt
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 producer must ad
Authors
Robert R. Rucker
The nutrition of salmonid fishes. I. Chemical and histological studies of wild and domestic fish.
The salmon fishing industry of the Pacific Coast is dependent on the survival and propagation of 5 species of salmon which spawn in rivers of that portion of the North American continent extending from California to Alaska. The development of these rivers for power, irrigation, flood control and other projects has drastically reduced the natural spawning areas available to salmon. To prevent the e
Authors
E. M. Wood, W. T. Yasutake, A.N. Woodall, J.E. Halver