During the week Tom and I spent in Puerto Ayora, we often walked the main drag, and at various times would see the local haul of fish being filleted. The women and men who filleted the fish were quick at doing their task and throwing the innards to the surrounding audience of pelicans, sea lions and at the odd time blue herons. Of course us homo sapiens made up the remaining audience. I'm guessing that when money exchanged hands- it was the local restaurant owners picking up the main course for the day's lunch and/or dinner hour.
One time there was a fish so big I thought it was a shark (there was not a head on the fish at the time when I arrived at the market so I was just going by size). I was told that it was a tuna. Right next to the woman who was filleting the fish was a sea lion who was howling away, awaiting not too patiently for some of the innards to be thrown his way, which she obliged. This of course was the one time I didn't have my camera with me. There was also one incident that I thought was quite interesting. One time at the fish market there were sea lions, numerous pelicans and a blue heron waiting to be fed by the fish cutters. As the food was thrown, the heron, a most delicate-looking bird, let it be known that the food was for him. The heron let it be known that he was on the top of the pecking order to get the food. Surprisingly, the sea lions and the pelicans, moved aside and the heron got the first dibs on the food thrown his way.
One of the things I missed when we went to Island Isabela was the fish market and the pier where we could watch for fish at night.