| Autor: |
Hedy Kling, J. G. I. Lark, G. Burton Ayles, J. Barica |
| Rok vydání: |
1976 |
| Předmět: |
|
| Zdroj: |
Journal of the Fisheries Research Board of Canada. 33:647-655 |
| ISSN: |
0015-296X |
| DOI: |
10.1139/f76-080 |
| Popis: |
The seasonal mortality pattern and the causes of the mortality of planted rainbow trout (Salmo gairdneri) were studied in eight small eutrophic lakes in central Canada used for extensive aquaculture. Two periods of mortality were revealed. The first occurred in all lakes during the first 60 days of residence in the lakes and resulted in the mortality of 60–90% of the numbers of fish stocked. The second period occurred in about 20% of the lakes and was due to low oxygen levels following the collapse of a bloom of Aphanizomenonflos-aquae. Rainbow trout are close to their physiological upper tolerance levels in these lakes. Possible environmental and biological causes of mortality during the first period are discussed. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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