I don’t know how long this has been here, but I heard about it a few months ago and finally made my way over last weekend. It is open Monday — Saturday 3 am — 11 am, so of course we went at 4 am. It is at the very end of Pier 33, so at that time it was a slightly scary walk down a dark empty tunnel with some dumpsters, but at the end there is light — Monterey Fish Market. The outside is not very friendly, since it is wholesale and mostly for packing orders. But inside it is like Santa’s workshop and you see so many different types of giant whole fish. We went to buy some salmon and tuna to make sushi, and found out they have 2 pages of different fish you can buy. They had lobsters, 5 kinds of oysters for $.75, scallops, etc. All freshly shipped and super fresh — I’m pretty sure this is where a lot of SF restaurants source their seafood. If you want to buy something, you can just tell someone at the front near the office. They are super nice and helpful despite us not knowing anything about fish wholesale(i.e. a «round» is an ENTIRE fish), and helped us de-skin and de-bone! Protip: be prepared to buy a little more than you expected(they have giant whole slabs of fish, and may not have that 1 pound exact chunk) and be prepared for your hands to smell fishy from the bag. We left with ~ 3 pounds of salmon and a big chunk of tuna — more than I’ve ever bought. Highly recommend if you’re cooking a big dinner party.