Aquaculture

Farmed Fish Welfare During Harvest and Crowding

Crowding and harvest stress cause significant suffering in farmed fish. Pre-harvest welfare protocols can substantially reduce these impacts.

Key Facts

Crowding fish before harvest triggers severe stress responses including cortisol surges
Crowding-induced stress affects flesh quality through increased lactic acid and glycogen depletion
Pre-harvest fasting reduces gut content but duration beyond 24-48 hours causes additional stress
Pump harvest systems that avoid net crowding reduce injury and stress responses
Welfare scoring systems for pre-harvest crowding are now included in certification schemes

Welfare Considerations

Harvest is a major welfare event for farmed fish that affects potentially millions of individuals at once. The intensity and duration of crowding stress during harvest represents a significant and often overlooked welfare cost. Protocol improvements are achievable without major capital investment and benefit flesh quality as well as animal welfare.

What You Can Do

Choose certified aquaculture products from schemes with harvest welfare requirements
Support research into welfare-friendly harvest technologies for farmed fish
Advocate for pre-harvest welfare monitoring standards in aquaculture legislation
Ask retailers about the harvest welfare policies of their aquaculture suppliers