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: 41756
A streptomycete pathogenic to fish
A streptomycete and pseutdomonad were isolated from blueback salmon, Oncorhynchuis nerka (WValbaum), and shown to be pathogenic to fish. Trhese organisms were isolated from young blueback salmon taken from a gr'oup that developed an increasing mortality after feeding about a month at the United States Fishery Station, Leavenworth, Washington. A superficial examination revealed only the presence of
Authors
R.R. Rucker
An investigation of the bactericidal action and fish toxicity of two homologous series of quaternary ammonium compounds
Bacterial gill disease when uncontrolled causes heavy losses among hatchery fish. The disease is characterized by a proliferation of the gill epithelium overlaid with masses of myxobacteria. The characteristic hyperplasia probably causes death by preventing the proper interchange of gases between the water and the blood stream of the fish.
A number of strains of myxobacteria differing primarily in
Authors
R.R. Rucker
Fact and fiction in spawntaking: Addenda
I was glad to see "Fact and Fiction in Spawntaking" by Wood and Dunn (1948) in a recent issue of the PROGRESSIVE FISH CULTURIST. Having spent two seasons at the Yellowstone Park station, I also attempted to find ways of increasing the efficiency of fertilization and several years ago conducted a few experiments along these lines. From these experiments I obtained some "facts and fiction" that I be
Authors
R.R. Rucker
The preparation of graphs for publication
This method may be helpful to many investigators where professional draftsmen are not available.
Authors
J.S. Gutsell
Forty-ninth Christmas bird count. 116. Southern Anne Arundel County, Md
No abstract available.
Authors
C.S. Robbins, R. E. Stewart
Vitamin A and carotene contents of some wildlife foods
In order to determine possible sources of vitamin A for quail, 37 species of insects and other invertebrates were analyzed for vitamin A and for carotene, and 26 species of seeds and fruits were assayed for carotene. The invertebrates showed no trace of vitamin A; but 8 herbivorous invertebrates and the praying mantis contained carotene. Most of the plants contained carotene--some of them a lot (d
Authors
R. B. Nestler, J.V. Derby, J.B. DeWitt