Seasonal Mortality of Rainbow Trout (Salmo gairdneri) Planted in Small Eutrophic Lakes of Central Canada
- 1 April 1976
- journal article
- research article
- Published by Canadian Science Publishing in Journal of the Fisheries Research Board of Canada
- Vol. 33 (4), 647-655
- https://doi.org/10.1139/f76-080
Abstract
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.This publication has 1 reference indexed in Scilit:
- THE EFFECT OF TENSION OF DISSOLVED OXYGEN ON THE TOXICITY OF UN‐IONIZED AMMONIA TO SEVERAL SPECIES OF FISHAnnals of Applied Biology, 1957