Wolf Fish are remarkably docile and will usually back slowly down their chosen hole as a diver approaches.
This particular individual was fed by divers for many years and became so accustomed to it that as soon as a diver approached, it came rushing out of its hole with jaws agape. Here you can see my (well-gloved!) left hand passing an edible crab (Cancer pagurus). I expected the crab to be snatched violently, probably with half my hand as well but the wolf fish took the crab with the most amazing delicacy and precision.
North Sea - Eyemouth, Berwickshire