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Geology topics

A. J. Ross

Publications and source records attributed to A. J. Ross.

At least 19 recordsLinked to original sources
USGS1978

Yersinia ruckeri sp. nov., the redmouth (RM) bacterium

Cultures of the redmouth (RM) bacterium, one of the etiological agents of redmouth disease in rainbow trout ( Salmo gairdneri ) and certain other fishes, were characterized by means of their biochemical reactions, by deoxyribonucleic acid (DNA) hybridization, and by determination of guanine-plus-cytosine (G+C) ratios in DNA. The DNA relatedness studies confirmed the fact that the RM bacteria are members of the family Enterobacteriaceae and that they comprise a single species that is not closely related to any other species of Enterobacteriaceae. They are about 30% related to species of both Serratia and Yersinia. A comparison of the biochemical reactions of RM bacteria and serratiae indicated that there are many differences between these organisms and that biochemically the RM bacteria are most closely related to yersiniae. The G+C ratios of RM bacteria were approximated to be between 47.5 and 48.5%. These values are similar to those of yersiniae but markedly different from those of serratiae. On the basis of their biochemical reactions and their G+C ratios, the RM bacteria are considered to be a new species of Yersinia , for which the name Yersinia ruckeri is proposed. Strain 2396-61 (= ATCC 29473) is designated the type strain of the species.

International Journal of Systematic Bacteriology↗
USGS1975

Phoma herbarum , a fungal plant saprophyte, as a fish pathogen

Phoma herbarum , a fungal plant saprophyte, was isolated from diseased hatchery-reared coho salmon ( Oncorhynchus kisutch ), chinook salmon ( O . tshawytscha ), and rainbow trout ( Salmo gairdneri ). The disease was observed at 10 national fish hatcheries in Washington and Oregon, but the low incidence of experimental infections indicate that it is only weakly contagious. Histopathological examination suggests that the air bladder is one of the primary organs infected. The visceral organs are also affected in both natural and experimental infections.

Journal of the Fisheries Research Board of Canada↗
USGS1973

Nutritional factors in the biochemical pathology of Corynebacterial kidney disease in the coho salmon (Oncorhynchus kisutch)

The influence of diet ingredient on the morbidity and biochemical pathogenesis of corynebacterial kidney disease was investigated using juvenile coho salmon ( Oncorhynchus kisutch ) fed the Abernathy dry ration made up with either corn gluten or cottonseed meal (isoprotein, isocaloric substitution). Evaluation of incidence of infection, pituitary activation and aspects of carbohydrate metabolism, acid-base balance, renal function, and hematopoietic activity showed that the actual disease incidence was about the same for both diets but the nonspecific stress of infection was more severe in fish fed the corn gluten.Discriminant function calculations combining four physiological parameters gave a probability of 0.86 for successfully diagnosing infected fish on the basis of these blood chemistry tests.

Journal of the Fisheries Research Board of Canada↗
USGS1973

Scolecobasidium humicola , a fungal pathogen of fish

Scolecobasidium humicola , a previously undescribed fungal pathogen of fish was isolated from coho salmon ( Oncorhynchus kisutch ). In natural infections the kidney was the organ most affected. The disease was difficult to transmit experimentally and appeared to be only weakly contagious.

Journal of the Fisheries Research Board of Canada↗
USGS1972

Effect of two Iodophors on bacterial and fungal fish pathogens

In in-vitro tests on nine species of bacteria and two species of fungi, the majority of strains tested did not survive a 5-min exposure to either Betadine or Wescodyne at a concentration of 25 ppm active ingredient.

Journal of the Fisheries Research Board of Canada↗
USGS1970

Vibriosis in fish

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Fish Disease Leaflet↗
USGS1968

Some metabolic effects of bacterial endotoxins in salmonid fishes

Coho salmon ( Oncorhynchus kisutch ) and rainbow trout ( Salmo gairdneri ) were highly resistant to endotoxins from both Escherichia coli and Aeromonas salmonicida (a fish pathogen) at 14 and 18 C.This resistance was investigated with liver tryptophan pyrrolase, liver glycogen depletion in vitro, and the arterial blood pressure as indicators. Liver glycogen depletion was accelerated by both endotoxins, but there was no significant cardiovascular response or effect on liver tryptophan pyrrolase activity. Since the cardiovascular effects of histamine were also limited, it was concluded that the metabolic effects of bacterial endotoxins in salmonids are qualitatively different from those of the higher vertebrates.

Journal of the Fisheries Research Board of Canada↗
USGS1966

Description of a bacterium associated with redmouth disease of rainbow trout ( Salmo gairdneri )

A description was given of a gram-negative, peritrichously flagellated, fermentative bacterium that was isolated on numerous occasions from kidney tissues of rainbow trout ( Salmo gairdneri ) afflicted with redmouth disease. Although the bacteria apparently were members of the family Enterobacteriaceae, it was impossible to determine their taxonomic position within the family with certainty. Hence it was recommended that their taxonomic position remain sub judice for the present. As a temporary designation RM bacterium was used. Redmouth disease was transmitted from infected to normal fish through the medium of water.

Canadian Journal of Microbiology↗
USGS1964

Crystal formation in furunculosis agar

SINCE ITS INTRODUCTION SOME MONTHS AGO, FURUNCULOSIS AGAR has been employed in the diagnosis of suspect furunculosis and also as a general purpose medium. During our work with this medium we have noticed discrete "colonies," of crystalline material, which very closely resemble microbial colonies. These crystal colonies are compact and appear on both the surface and subsurface; they occur in inoculated slants and plates incubated for long periods (2 to 3 weeks), as well as in uninoculated stored medium. As the crystal colonies could be confusing to workers using this medium, we decided to attempt to identify them and also to determine whether storage conditions and different lots of medium affect crystal formation.

Progressive Fish-Culturist↗