How much is the chance of otaining knowledge entries when fishing? I thought it's 100% when you catch a certain fish, but obviously that's not the case. For example, I caught like a dozen "Black Shiners", and I'm still missing the knowledge entry. There seems to be no relation to grade either, some green grade fish are just as persistant in avoiding to produce a knowledge entry as yellow grade ones. I tried increasing the chance to gain knowledge with pets, to no avail. Looks like it either registers on the first catch or it doesn't.