Scope

This record documents how salmon are exploited within globally standard animal-use systems. It describes dominant, routine practices across industrial aquaculture and wild-capture fisheries, independent of country-specific regulation or branding narratives.

Differences in scale, enforcement, and legal framing are documented in country records. System-specific mechanisms are documented within industry records.

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Species context

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Natural versus exploited lifespan

Natural lifespan

In the absence of exploitation, wild salmon typically live 3–8 years depending on species and environmental conditions. Some species may live longer before completing spawning cycles.

Lifespan under exploitation

Within exploitation systems, salmon are typically killed far earlier than natural ecological completion:

• Aquaculture systems: commonly slaughtered at 12–24 months
• Wild-capture fisheries: killed upon reaching market size, often before natural spawning

In aquaculture, salmon are prevented from completing migratory cycles entirely. Their lives are structured around accelerated growth and fixed harvest timelines rather than ecological maturity.

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Systems of exploitation

Salmon are exploited across overlapping systems:

• Industrial aquaculture (salmon farming)
  Salmon are bred, hatched, confined, fed, medicated, and slaughtered in sea cages, tanks, or recirculating systems.
• Wild-capture fisheries
  Salmon are captured during ocean phases or while migrating upriver to spawn.
• Selective breeding and hatcheries
  Controlled breeding programs prioritise rapid growth, feed efficiency, flesh colour, and disease tolerance.
• Feed and reduction fisheries
  Wild fish are captured and processed into fishmeal and fish oil to feed farmed salmon.
• Byproducts and processing industries
  Salmon bodies are processed into fillets, smoked products, oils, supplements, pet food inputs, and industrial derivatives.

These systems rely on global supply chains, hatcheries, feed production, sea-cage infrastructure, and high-throughput processing facilities.

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Living conditions across system types

Industrial aquaculture

In sea-cage systems, salmon are confined in large net pens in coastal waters. Stocking densities involve tens or hundreds of thousands of fish per cage. Movement is restricted to a fixed volume of water.

Crowding leads to chronic stress, aggression, fin erosion, skin lesions, and parasite infestation. Environmental complexity is absent. Salmon cannot migrate, forage naturally, or escape dominant individuals.

Waste accumulates beneath cages, altering surrounding marine ecosystems.

Freshwater hatcheries

Eggs are fertilised artificially. Juvenile salmon (smolts) are raised in tanks or raceways under artificial lighting and feeding regimes before transfer to sea cages.

Wild-capture contexts

Wild salmon are caught using nets, traps, and lines during ocean feeding phases or during spawning migrations. Capture involves crowding, compression, injury, and suffocation.

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Standardised lifecycle under exploitation

While practices vary, farmed salmon typically move through a standardised lifecycle:

• Broodstock selection and artificial fertilisation
  Adult salmon are stripped of eggs and sperm manually. Fertilisation occurs under controlled conditions.
• Incubation and freshwater rearing
  Eggs hatch in hatcheries. Juveniles are raised in tanks until reaching transfer size.
• Sea-cage grow-out phase
  Salmon are transported to marine cages and confined for accelerated growth using concentrated feed.
• Grading and handling
  Fish are crowded, pumped, and mechanically handled during transfers, treatments, and harvest preparation.
• Harvest and slaughter
  Salmon are crowded tightly, pumped onto slaughter vessels or facilities, stunned inconsistently, and killed.

Wild salmon follow a shorter pathway: migration, capture, death, and processing.

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Chemical and medical interventions

To maintain high-density production, salmon are subjected to systemic chemical interventions:

• Antibiotics to manage bacterial outbreaks
• Antiparasitic treatments for sea lice infestations
• Chemical baths and hydrogen peroxide treatments
• Vaccinations administered by injection during early life stages
• Artificial pigmentation additives in feed to control flesh colour

Sea lice infestations are routine in high-density systems and require repeated treatment cycles. Handling for treatments results in additional stress and mortality.

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Slaughter processes

Salmon slaughter methods vary but frequently involve inadequate stunning. Common practices include:

• Carbon dioxide exposure
• Electrical stunning systems with inconsistent effectiveness
• Percussive stunning at scale
• Asphyxiation during pumping and air exposure

Fish are crowded densely prior to harvest, leading to compression injuries and oxygen depletion. Some salmon regain consciousness during bleeding.

In wild-capture contexts, salmon often die from suffocation, crushing, or decompression before processing.

Mass mortality events also occur in aquaculture due to disease outbreaks, algal blooms, oxygen depletion, or equipment failure. In such cases, millions of salmon may die in single events.

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Slaughterhouse labour impact

Salmon processing relies on high-speed filleting and packaging lines. Workers are exposed to:

• Repetitive strain injuries
• Cold, wet, and hazardous environments
• Psychological detachment associated with continuous mass killing

Production quotas and perishability intensify throughput pressures.

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Scale and prevalence

Salmon are among the most intensively farmed fish globally. Hundreds of millions of farmed salmon are killed annually. Wild-capture fisheries add additional millions.

Aquaculture production has expanded rapidly, with farmed salmon now representing the dominant supply source in many markets.

Salmon exploitation drives global trade networks and feed supply chains that extract additional wild fish populations.

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Ecological impact

Salmon exploitation produces extensive ecological harm:

• Sea-cage waste accumulation and nutrient pollution
• Transmission of parasites and disease to wild fish populations
• Escape of farmed salmon into wild ecosystems, altering genetic integrity
• Large-scale capture of wild fish for feed production
• Habitat disruption in spawning rivers due to overfishing and infrastructure

Wild salmon populations in multiple regions have declined due to combined pressures from overfishing, habitat alteration, and aquaculture spillover effects.

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Language and abstraction

Salmon are commonly referred to as “seafood,” “harvest,” “stock,” or “production biomass.” Farmed salmon are marketed using imagery of natural rivers and pristine environments despite confinement conditions.

Colour grading, portioning, and branding fragment the animal’s body into marketable units, obscuring individual identity and lifecycle disruption.

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Editorial correction notice

Salmon are frequently framed as renewable marine resources or sustainable protein sources. This record documents salmon as migratory animals systematically confined, extracted, and killed across aquaculture and wild-capture systems, independent of sustainability narratives or marketing language.