The environmental conditions in sea cages including water quality, oxygen levels and sea lice burden directly determine welfare outcomes for farmed fish.
Sea cage environmental conditions are dynamic and require continuous monitoring rather than periodic spot checks to maintain welfare. Fish at the bottom of deep cages may experience conditions entirely different from surface fish. Oxygen depletion events can develop rapidly during warm still weather and cause mass mortality if undetected. Sea lice populations cycle with local wild fish populations creating seasonal welfare challenges. Welfare-focused sea cage management uses continuous environmental monitoring, adaptive feeding systems that distribute food to reach all fish, and rapid response protocols for welfare-threatening environmental conditions.