Make shrimp and pufferfish more common

[Whele]

I'd wanted to have bait function as a catch rate modifier for specific fish, I just didn't get around to coding it. Would approve of this in a PR

Afaik Pufferfish already are tied to using meat as bait. I think they can only appear when using meat.

Sure but like I said, the pool is so diluted that hardly anyone goes through the trouble to gather the special culinary fish. Hence my suggestion.