I suck at math, so I'm asking how many chests would I need to store every fish of all qualities? There is 60 fish, And there is 3 quality per fish. There are 36 slots per chest Help xD ?
I assume you don't have a calculator at hand, but sure I can help you out. 60 fish times three for each quality fish means a total of 180 fish. 180/36 is, conveniently enough, exactly 5.
Why are you keeping the different qualities? Just give out/use whatever you have. Just keep multiples of the same kind. You don't need them all, especially after you're done with the cooking achievement. I have two fish chests and I have fishing buff food in them too.
I generally only have 2 for fish. One is for regular fish. I sell all the gold ones for money, and keep the regular and silver for cooking or Bulletin Board requests. The second is for seafood, but not really fish; like lobster, squid, eel, clams, snails etc. If it comes out of the water but doesn't have fins, it goes into this one.
Any shell fish which can be foraged has the potential to be Iridium (with Botanist perk), so that adds a 4th clam, mussel, oyster, and cockle. You can probably still get away with 5 chests though since (unless mods are involved) most Legendary fish can only be caught once (the Legend itself seems to be an exception). Also, it is difficult (maybe impossible?) to get gold quality of some of the fish in special locations such as the desert.
AFAIK there's no way to get the crab pot only shellfish in gold or silver either, they're regular quality only, so that's crayfish, snail, periwinkle, lobster, crab and shrimp