RE: are minks hurting anyone elses muskrat pop.
This has been a common misconception in wildlife for a while now. A classic study was done a long time ago about the muskrat/mink interactions. The study took 25 years (in Iowa) and finally determined that 1) muskrat populations are not controlled by mink predation and mink are removing surplus animals 2) muskrat population numbers are determined by territorial hostility of muskrats toward one another, and the muskrats driven out by this hostility over space are getting killed my mink.
Krebs, Charles J. Ecology: the experimental analysis of distribution and abundance. 5th ed. 2001.
from the chapter on Competition: Predation.
Sounds like your rat population is increasing. I would be trying hard to trap both and capitalize on it.
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