The problem is farming seafood in its contemporary best-practice manner which is focused on output rather than maintaining a sustainable ecology.

All other issues - be it wild-caught marine-animal ingredients being eroded as a finite input, or simply killing off all-around it due to the increased prevalence of sea lice and industrial activity - are a product of the practices, not the concept.

The problem is exacerbated in a grotesque feedback loop as well as the sea lice can transfer from farms and reduce the health and survival of wild salmon and trout in particular - leading to chemical treatments and other practices which result in everything from algae bloom to facilitating invasive species to straight-forward pollution.