Some potentials and limits of the leucocrit test as a fish health assessment method
| Autor: | R. W. Gould, W. T. Yasutake, Gary A. Wedemeyer |
|---|---|
| Rok vydání: | 1983 |
| Předmět: |
Veterinary medicine
biology Aquatic Science biology.organism_classification medicine.disease_cause medicine.disease Microbiology Trout Aeromonas salmonicida medicine Oncorhynchus Renibacterium salmoninarum Yersinia ruckeri Salmo Ecology Evolution Behavior and Systematics Epizootic Subclinical infection |
| Zdroj: | Journal of Fish Biology. 23:711-716 |
| ISSN: | 1095-8649 0022-1112 |
| DOI: | 10.1111/j.1095-8649.1983.tb02948.x |
| Popis: | The sensitivity of the leucocrit as a stress tolerance and fish health assessment method was evaluated by subjecting juvenile coho salmon, Oncorhynchus kisutch, or steelhead trout, Salmo gairdneri, to standardized crowding, handling, temperature and disease challenges. The leucocrit was a sensitive indicator of the physiological stress resulting from crowding at population densities of 0·2–0·4 kg l−1, and to the stress of handling and to temperature changes. It was relatively insensitive to physiological sampling procedures which supports its continued development as a stress assessment method. In the case of fish diseases, subclinical or active Renibacterium salmoninarum and Yersinia ruckeri infections had essentially no effect on leucocrit values. In contrast, active Aeromonas salmonicida infections significantly depressed the leucocrit. However, no change was seen during the subclinical (incubation) phase prior to the development of an epizootic. Thus, the potential of the leucocrit as a fish health assessment method appears limited. |
| Databáze: | OpenAIRE |
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