It may be called the 'Ashenfall' monkfish, but you'd be hard-pressed to find it anywhere other than in Umbral Sands. That's mostly down to a lack of trade. The Moon Garou are an isolationist sort, preferring to keep their trading partners to other Moon Garou. Their closest non-garou partners would be the Black Knights but they, too, like to keep to themselves, and would prefer to deal with other humans over the garou.
Which is a shame, really, as monkfish deserves to go continental. Ashenfall monkfish is like trout, but with a slight fizzing sensation, similar to popping candy. If you've got a child or garou cub who won't eat their fish, then try them on Ashenfall monkfish. In our house, it's a gateway fish, leading onto other, less gimmicky fish.