Timeworn maps

[LineageRazor]

I see, so I guess I was trying at one of those "hidden" fishing holes.

If you see the message, "You sense fish swimming below but don't know where." it means that you've found a hidden fishing hole. If the hole is level 1, 5, 10, 15, or 20, you need Gulleye (level 20 class trait) to fish there. If the hole is 25, 30, or 35, you need Gulleye II (level 35 class trait). If the hole is 40, 45, or 50, you need Gulleye III (level 50 class trait).

For any other fishing hole, you are always able to cast your line. Whether you are able to catch something depends on whether you're using sufficiently high-level bait.