Sea lions face welfare threats from fishery entanglement, shootings by fishers, harmful algal blooms, and competition for fish stocks in waters increasingly depleted by industrial fishing.
Sea lion welfare reflects the complex intersection of a recovered species with heavily depleted fishery resources. Individual sea lions facing illegal shooting experience acute welfare harm from a criminal act. Domoic acid poisoning causes seizures, neurological damage, and death — a welfare crisis driven by human-caused ocean warming. Entanglement causes drowning and injury. The conflict between sea lions and fishers represents a structural problem: species recovery has occurred while fish stocks have declined, creating intensifying competition. Lethal removal of sea lions at fish passage sites — even when legally permitted — represents a welfare cost to individual sea lions that must be weighed against salmon conservation benefits. The welfare case for sea lions is strongest when human-caused harms (shooting, entanglement, harmful algal blooms) are addressed, rather than treating sea lions as problems to be managed for fishing industry convenience.