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U may think its dumb cause you live in Montana. I'm from ohio where invasive species have screwed up many good places to fish. Inconvenient maybe. Dumb no. Stupid people accidentally put things in lakes all the time that they shouldn't. I'm glad Wyoming has these rules.
I seined up a minnow the other day which had a 'Wyoming Native' sticker on it...
Might be more productive to post a question on the G&F thread regarding the issue. Be respectful in your approach and I bet you get a respectable answer back.
How would you know if they are in all those lakes, and how would you know just which "minnie" you are looking at? would you examine every minnow in the bucket to make sure of all the species you are carrying to a lake where you "know" what minnow species are native or found there anyway? The real point is that invasive species and the spread of undesirable species has caused major fisheries management problems and in turn, the degradation of fishing in many areas of our state, our country, and elsewhere. If you have a problem with the regulation communicate with a G&F fisheries biologist and they can help you with the reason for the regulation.
It's not that hard to identify a minnow when you go to hook it.
I think that this question or statement really comes about when you have a reservoir that crosses statelines such as Big Horn Reservoir. I see this with fishereman when they have to come to Wyoming to get on the ice but wish to fish in Montana. Therefore they can't buy minnows in Wyoming to use on the otherside and can't buy minnows in Montana to use in Montana because you can not transport minnows across state lines.
Here is your solution: make a test like hunter's safety (minnow safety). In order to possess live minnows, you must be able to identify all non-game fish in Wyoming, as well as what drainages they are already in. Then you know what one's you can use where. There are 26 species, and UW offers an entire class to learn them!