What is "follow 3 shoals"?
When you see the water start to bubble and be full of fish. click on it, even if you're already fishing in that spot
Cosmo_Hill's got it right, it's the shimmering patch of fish that turns up on the water now and then. Tap it and they bite straight away for a short while. The hint didn't say that, so it does now. Thanks for asking, it helped fix it.
