I've always found that in particular any fish that's got some size to them ( but not exclusively) like a grouper, whale shark, etc - if they see me/us it's virtually guaranteed that they are going to come over and mooch around with a diver. This is common with sea snakes as well when working on the bottom. That's why it's always so heartbreaking when l see these " 30 year old 12 year old's " ( man-childs) proudly holding some big poor dead fish, it's colours now blackened.....when l know that in very many cases that poor thing CAME TO the " diver " ( poacher ) out of curiosity, just like a friendly dog running up to us..... tragic.