In 2019, when IntraFish last compiled a list of the major -- or most visible, at least -- land-based salmon farming projects in the planning stage or in operation around the world, it was far from clear which projects were for real, and which ones were part of a mad scramble to take advantage of investor excitement.

Four years later, there has been lots of development and -- crucially-- significantly more investment. But there is still no clear answer to the question of whether land-based salmon farming will become a reliable and significant complement to traditional farming.