Wasn't saying it was a realistic representation of fishing. It's only a game, not a fishing sim X)
Also, I've yet to fish in a spot where there's only 1 kind of fish at any 1 depth... Even if you know the sweet spot for the fish you're after, that's not always the fish that's on the hook. Even if you're keeping tabs on the remainder bar, multiple fish hang out at the same depth with the same remainder bar. Then there's the fish from higher and lower depths catching on your hook from time to time.