Lake trout monitoring

Summer profundal index netting (SPIN) is a rapid assessment method with a low mortality rate that is used to collect information about Lake Trout. Nets that are 64 m in length with eight panels of eight different mesh sizes are set at random locations across four different depths. Length and species of each fish caught in the net is recorded and the fish is then released. Length, weight, sex, age and stomach contents are recorded from fish that die during netting.

Age and growth rates are based on looking at the otoliths, ear bones of fish, much like the way trees rings are used to age trees. Otoliths, are hard calcium carbonate bones that grow a new layer each year. These bones are removed from fish that die during the netting process for all species, and sent to Ontario Ministry of Natural Resources for aging.

SPIN was conducted on Kingsmere Lake in 2009, 2015 and 2017. In 2018, Wassegam Lake was sampled. Wassegam Lake (where there is limited angling pressure) will help indicate if the changes to the trout population is isolated to Kingsmere Lake or indicates broader regional causes, such as climate. Further study of the lake ecosystem’s water quality, aquatic habitat and spawning grounds, as well as improved tracking of recreational fishing, will increase understanding of the population and potential actions that may be required to sustain viable population.

If you’d like more information on SPIN results, contact the Visitor Centre for more information.

• Public engagement for lake trout conservation

Related links

• Water Quality
• Loon Abundance
• Colonial Bird Population
• Aerial Extent and Distribution of Open Water