you would think with a Northern strain, the genetics would be in the lake. Just my thoughts. I think it is something else. I heard that the MDC also tried to introduce nothern pike to the lake as well, which didn't fair too well. Stockton does have records for Northern pike, but I beleive that these have been eradicated. Might be something about the lake itself that isn't condusive to these fish. Just my two cents.