Geology topics
H.E. Johnson
Publications and source records attributed to H.E. Johnson.
The freshwater mussel (Anodonta sp.) as an indicator of environmental levels of 3-trifluoromethyl-4-nitrophenol (TFM)
Abstract not submitted to date
Toxicity of the lampricide 3-trifluoromethyl-4-nitrophenol (TFM) to 10 species of algae
Abstract not submitted to date
Studies of transmission of mycobacterial infections in Chinook salmon
THE INCLUSION OF VISCERA AND CARCASSES OF TUBERCULOUS ADULT SALMON IN THE DIET OF JUVENILE SALMONIDS is considered to be the major source of mycobacterial infections in hatchery-reared fish (Wood and Ordal, 1958; Ross, Earp, and Wood, 1959). In considering additional modes of infection, we speculated about transovarian transmission or a mechanical process arising from contamination of the ova at the egg-taking stage with subsequent entry of the bacteria into the egg at the time of fertilization. This paper is a report on observations made during an experiment designed to test the latter theories.
An interim report on gill disease
GILL DISEASE among fish, a disease which is characterized by a proliferation of the gill epithelium, has been attributed to a number of different causes. Generally, there are two recognized types: the eastern or bacterial type, in which long filamentous bacteria can always be demonstrated; and the western type, in which, by definition, bacteria cannot be demonstrated.