Inspecting Tail Meat
The tails have the cuts in them so that the buyers can inspect the quality of the meat. Each carries a flashlight so they can clearly see.
Entrance To Fish Market
This is the entrance to the larger fish market. You can see the carts that run through the market bringing boxes of fish out to the larger street trucks.
Ascidians - Halocynthia roretzi
The internet has come through - apparently they are ascidians - specifically Halocynthia roretzi. Ascidians are sea squirts — hermaphrodite marine invertebrates that live in shallow ocean waters, and which are thought to exhibit characteristics of the evolutionary ancestors of chordates and vertebrates.
(Thanks goes to Karen Sanamyan at ascidiacea.com/
Carving Up Tuna
You can see the body is fully of ice - I'm not sure if that means this is fresh fish or frozen, but if it was frozen they would probably be using the band saw.
Processing Area
The hanger doesn't have central lighting (that I saw), but there are large sky lights. Most of the vendors had lighting over their sales area, but some parts of the building were quite dark.