- Evaluate hybridization between hatchery-raised Kamloops Rainbow Trout and naturalized (wild) Steelhead
- Examine the utility of genetics to identify adult Steelhead that were stocked as fry and determine their contributions to the adult catch in the North Shore spring fishery
- Determine strain composition, genetic variation and structure of wild Rainbow Trout among North Shore Rivers using genetic markers
To this end, a list of sample rivers was developed which covers the entire north shore geographically. Scale samples submitted by each volunteer angler permit holder are individually tagged and marked with other information such as date collected, river location and sex. Where sample size is limited or deficient by location, follow-up surveys are conducted by the DNR using electro-fishing methods to collect additional samples.
Following cataloging of the samples at the Duluth Fisheries Office, each collection packet is sent to the genetics laboratories in St. Paul for testing and analysis.
On Saturday, March 18th 2017, the initial results from the first year of the SGP were released by DNR Migratory Fish Specialist Nick Peterson at the Great Waters Fly Fishing Expo.
Minnesota Steelheader is here summarizing some of those initial findings from year 1 of the program. We are reserving comment at this time with the following notable exceptions:
1. We strongly encourage each and every one of you reading this post to first gain some historical perspective as well as necessary factual information by reading the following in their entirety:
Comparative Survival of Naturalized Steelhead, Feral Kamloops, and their Hybrids During Egg and Fry Stages
Rainbow Trout Management Summary for the Minnesota Waters of Lake Superior and its Tributaries 2012
Lake Superior Management Plan Draft
2. The following results are what they are. We caution against a rush to judgement, there are even more critical information needs now going forward than ever before, and we cannot stress enough the importance of continuing with the SGP
- Kamloops have been stocked in Minnesota waters since the early 1970’s
- Kamloops were originally stocked to provide a creel fishery while attempting to reduce potential negative impact on steelhead during population recovery
- Limiting the geographic range of stocking was incorporated into the Kamloops program as a way to reduce the potential for genetic introgression (introduction of Kamloops genes into steelhead)
- There has always been recognition that the potential for hybridization exists
- Naturally-produced "pure" Kamloops juveniles and adults exist shore-wide
- Naturally-produced pure adults were sampled in 4 rivers and in Lake Superior
- Naturally-produced pure juveniles were sampled in 5 rivers
- Naturalized pure/wild Kamloops are not distinguishable from Steelhead
- Hybridization is occurring
- The majority of fish sampled came back as pure steelhead >80%
- These hybridized fish, "Steelloops" are not distinguishable from Steelhead
- Gamete wastage (a negative reduction in reproductive/breeding success due to incompatibilities between steelhead and kamloops eggs and sperm) is a concern
- Continue the Steelhead Genetics Project in 2017
- Angler participation is critical
- Increasing the sample size of adult fish, particularly at small rivers is critical
- Additional study goals and objectives have been developed, more are being determined
- Test all French River wild adults before using eggs to preclude hybrid or pure Kamloops from potential steelhead stocking
Nick Peterson: Migratory Fish Specialist, MN DNR
firstname.lastname@example.org | 218-302-3264
As an organization, Minnesota Steelheader will continue to work closely with the Minnesota Department of Natural Resources to further promote and advance the development of the project.