A streptomycete pathogenic to fish
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Abstract
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 fungus (probably Sap0olcynia parasitica), which wvas on the gills and was eliminated by treatment with a quaternary ammonium salt. Although the fungus infection was eliminated, the mortality continued. It was observed by the station biologist at the time that the majority of the fish in the hatchery troughs were healthy, but that there w-as alwzays present an apathetic group that hud(dled on the bottom, refused food, ancl eventually weakene(l and died. The bulk of the daily mortality was composedI of fish from this group. The apathetic group received constant recruitment from the more vigorous stock, and their number showed a gradual increase rather than clepletion. A more critical examination of the larger affected fish revealedl that thc kICidneys and spleens weIe disintegrating; mycelial masses w-ere sporadically observed in the body cavity; congestion wN-as present in the gastrointestinal tract; some hemorrhagic areas were present in the body musculature; an(l a few fish had a perforating ulceration of the body wall. Furi'unculosis was immediately suspected, and attempts were made to isolate from the diseaseti fish Bacteriim .salininicida Lehmann and Netumann, the etiological agent of furunculosis. B. salmornicida Awas not recovered, however, even after repeated attempts at isolation. Subsequently it was discovered that two other organisms, a streptomycete and a pseudomonad, were characteristically present in the diseased fish. Both organisms were found experimentally to be pathogenic to fish.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | A streptomycete pathogenic to fish |
| Series title | Journal of Bacteriology |
| Volume | 58 |
| Issue | 5 |
| Year Published | 1949 |
| Language | English |
| Publisher | American Society for Microbiology |
| Contributing office(s) | Western Fisheries Research Center |
| Description | 6 p. |
| First page | 659 |
| Last page | 664 |
| Online Only (Y/N) | N |
| Additional Online Files (Y/N) | N |
| Google Analytic Metrics | Metrics page |