I don't see why everyone does not notice but there seems to be no way to "oppose fish direction" when you can not tell which direction the fish is going? Also the fishing line sometimes will not change colors at all no matter what I do and yet the fish will not reel in.
Might be your graphics settings, but you should be able to see ripple effects on the water in the way the fish is pulling the bait. Just oppose that movement, and let him have some line if the line turns red/ you hear the fishing rod click in low frequency. The fish will get tired eventually.