Updated 2023-11-08 16:54:13
Lake Michigan -> 1.0 Salmonine (Salmon and Trout) -> Lake Trout Fall Age Class
Reporting Interval
2016 - 2021
Area
Northern Refuge
Meeting Target?
Does Not Meet
Indicator Trend
Upward trend
Confidence?
High
1.2.5 Ten or more age-classes of age-7 or older spawning lake trout observed during fall surveys in the Northern Refuge
Developing an abundant spawner population is an interim goal of the lake trout restoration plan (Bronte et al. 2008). At reefs assessed in northern Lake Michigan, the number of lake trout age-classes older than age-7 has remained below the target level of 10 (Figure 1), but an increasing trend has been occurring since 2014.
Figure 1. Number of lake trout age-classes older than age 7 represented in the catch from fall spawner surveys in the Northern Refuge of Lake Michigan.
Methodology
Large graded-mesh fall gillnet survey. To attain this metric, the benchmark level of 10 age-classes older than age 7 must be matched or exceeded.
Other Resources
- Bronte, C. R., C. C. Krueger, M. E. Holey, M. L. Toneys, R. L. Eshenroder, and J. L. Jonas. 2008. A guide for rehabilitation of lake trout in Lake Michigan. Great Lakes Fishery Commission Miscellaneous Publication 2008-01. Available at: http://www.glfc.org/pubs/misc/2008-01.pdf.
- Lake Trout Working Group (LTWG). 2022. 2021 Lake Michigan Lake Trout Working Group Report. Great Lakes Fishery Commission, Ann Arbor, Michigan. Available at: http://www.glfc.org/pubs/lake_committees/michigan/LTWG_docs/Lake%20Trout%20Working%20Group%20Report%202021.pdf.
Contributing Author(s)
- Lake Michigan Technical Committee - Lake Trout Working Group