Recent tests indicate that the fish die-off in Fauvel Lakes may be due to a significant oxygen shortage beneath the ice cover. Following reports of dead fish in the area, the City of Blainville called upon the Parc de la Rivière-des-Mille-Îles to assess the dissolved oxygen levels in the lakes.
Causes of the Fish Die-Off
The Parc de la Rivière-des-Mille-Îles, recognized for its expertise in natural resource conservation, has previously conducted similar studies, including one in Rosemère. Historical data shows a similar incident occurred in Fauvel Lakes in 2014, when ice cover led to decreased oxygen levels, affecting fish survival.
Preliminary Test Results
- Oxygen shortage likely a key factor in fish mortality.
- Additional tests are planned at varying depths to confirm findings.
- The lakes’ shallow depth of less than five meters contributes to the phenomenon.
- Nearly entirely fed by groundwater, which has low dissolved oxygen levels.
The oxygenation process relies solely on the interaction between water and the atmosphere, a process that is obstructed when ice forms over the water. The situation in Fauvel Lakes is particularly concerning due to these unique characteristics.
Monitoring and Future Actions
The City of Blainville has also learned that the Ministry of Environment, Wildlife and Parks is conducting water quality analyses to further investigate the cause of the fish die-off. The city is committed to closely monitoring the situation as developments unfold.
