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Other than in shops I can't find them. I have swam around certain places they are supposedly and not found one yet, and it is THE best ingredient for poisons
Try searching in rivers, particularly near waterfalls. Good luck trying to get any one specific fish but that's your best bet. I haven't run into a "Fish Vendor" yet.
When you get out of Helgen Dungeons for the first time, head up river towards the islands in the middle of the river. Theres a fisherwoman (if thats a word) who sells fish. Not sure if she sells river bettys but thats where i would check. What do you want them for?