Seal and Sea Lion Welfare in Aquaculture Conflict

Seals and sea lions interact with aquaculture operations, leading to lethal control in many countries. Non-lethal deterrents and coexistence strategies offer welfare-positive alternatives.

Key Facts

Sea lions and seals cause significant fish losses at salmon farm net pens in many regions
Lethal control is permitted in some jurisdictions when non-lethal measures have failed
Acoustic deterrent devices can deter pinnipeds but may also affect other marine life
Net pen design improvements including doubled nets reduce predator access significantly
Some farms have achieved coexistence through management changes without lethal control

Welfare Considerations

Lethal control of pinnipeds for aquaculture protection causes welfare harm to socially complex, long-lived mammals. The welfare cost of killing sea lions must be weighed against the economic losses they cause and the availability of non-lethal alternatives. Net pen design improvements, acoustic deterrents, and hazing represent a management continuum that should be exhausted before lethal control is considered. Some farms demonstrate that lethal control is not necessary for commercial operation.

What You Can Do

Support aquaculture welfare standards that require exhaustion of non-lethal alternatives before any lethal control
Advocate for improved net pen design requirements that reduce predator access
Donate to organizations researching effective non-lethal pinniped deterrent systems
Learn about the welfare evidence for different predator management approaches in aquaculture