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Judging from the photo, I'm not sure if this is a true deep-sea species. They have been kept at other UK coastal aquaria, fishermen occasionally dredge them up in their nets. They're very difficult to keep alive as they don't usually take to dead food.
They produce what is commercially retailed as 'monkfish', which is confusing given that Angel sharks are also known as monkfish. However they both feed in the same way.
Kiang - as you mention Oban, I suspect you're talking about Angel sharks, which are far larger and indeed do make a dramatic feeding display in captivity (when you can actually get them to feed).
the fish in the photo isn't a deepsea anglerfish but it is a species of anglerfish (of the family Lophiidae). It is the species commonly known in the UK as goosefish, or monkfish, or just simply as anglerfish.