Originally Posted by II Mortis II
Okay cool thank you, that gives me a basis of sorts.. Do you mean like the river that runs past Riverwood for example or smaller than that, like a stream?
Smaller than the river going past riverwood, but I have found both of them in the lake section (up-river near some ruins, and further down past whiterun, after the waterfall near where the river bends) to be truthful, just not as often. The most I have found them is in little ponds and the like, but be aware that there usually isn't too many in them at one time. If you have the cash and you are looking to get a fair few of the fish, it may be easier and less time consuming to just travel around to different potion shops and buying them when they are in stock.