This photgraph was of the island of Bequia in the West Indies. Although it is not directly related to underwater photography I have included it together with information about whaling in Bequia. The Humpback Whale 'Megaptera novaeangliae'. In the case of fishermen it is not hard to understand as nearly every human society has grown used to killing fish.
Fishing is a legitimate way of livelihood.
And fishermen often regard anything in the sea as fish. Whales and Dolphins are not fish, they are mammals. It is not unusual for those nations that still catch whales and dolphins to refer to them as fish. In St Vincent, pilot whales are called Blackfish. There are only a few nations that still catch whales, Japan, Norway, and some of the West Indian islands.