Information
Version: B | 1.2 (2022-07-20)
WelfareScore | farm
Condensed assessment of the species' likelihood and potential for good fish welfare in aquaculture, based on ethological findings for 10 crucial criteria.
- Li = Likelihood that the individuals of the species experience good welfare under minimal farming conditions
- Po = Potential of the individuals of the species to experience good welfare under high-standard farming conditions
- Ce = Certainty of our findings in Likelihood and Potential
WelfareScore = Sum of criteria scoring "High" (max. 10)
General remarks
Oncorhynchus kisutch is a Pacific salmon species distributed in the North Pacific basins from northern Japan through Kamchatka, across the Bering Sea to Alaska, and south through all coastal areas to California. O. kisutch has been introduced into many areas of North America, Asia, Europe, and South America. There are two strains, an anadromous one that migrates and a resident one that stays in freshwater lakes. Within the migratory strain, two morphotypes have been described, an "ocean/coastal" type with small median fins and more streamlined body that lives offshore and an "inshore/interior" type with large median fins and a robust body that remains within inside waters. In anadromous O. kisutch: eggs hatch in streams, juveniles (parr) live in streams for one year and metamorphose into smolts that will migrate to the ocean. In the ocean, smolts grow into adults and might migrate up north. When they are close to maturity, they migrate back to their original streams to spawn. Females create several nests in a defended area called redd. O. kisutch dies after reproduction. In some farms, only females are raised, which are less aggressive. Some farms have an accelerated cycle for maximising growth and reducing the hatchery cycle by 9 months: they rear them in fresh water until parr/smolt, then place them in salt water (during peak of PHOTOPERIOD - July) until harvest, which occurs at around 19 months of age at 2.5-3.5 kg. Because of their need to migrate as adults, it is unlikely that current farms can provide this welfare need. Further research needs to be done to accommodate this need into farming conditions and on living offshore (home range, aggression, substrate). Currently, the main producer is Chile, with some smaller production in Japan, Canada and the USA. O. kisutch will be affected by climate change.
1 Home range
Many species traverse in a limited horizontal space (even if just for a certain period of time per year); the home range may be described as a species' understanding of its environment (i.e., its cognitive map) for the most important resources it needs access to.
What is the probability of providing the species' whole home range in captivity?
It is low for minimal farming conditions. It is medium for high-standard farming conditions. Our conclusion is based on a low amount of evidence.2 Depth range
Given the availability of resources (food, shelter) or the need to avoid predators, species spend their time within a certain depth range.
What is the probability of providing the species' whole depth range in captivity?
It is low for minimal farming conditions. It is medium for high-standard farming conditions. Our conclusion is based on a medium amount of evidence.3 Migration
Some species undergo seasonal changes of environments for different purposes (feeding, spawning, etc.), and to move there, they migrate for more or less extensive distances.
What is the probability of providing farming conditions that are compatible with the migrating or habitat-changing behaviour of the species?
It is low for minimal farming conditions. It is medium for high-standard farming conditions. Our conclusion is based on a medium amount of evidence.4 Reproduction
A species reproduces at a certain age, season, and sex ratio and possibly involving courtship rituals.
What is the probability of the species reproducing naturally in captivity without manipulation of these circumstances?
It is low for minimal and high-standard farming conditions. Our conclusion is based on a medium amount of evidence.5 Aggregation
Species differ in the way they co-exist with conspecifics or other species from being solitary to aggregating unstructured, casually roaming in shoals or closely coordinating in schools of varying densities.
What is the probability of providing farming conditions that are compatible with the aggregation behaviour of the species?
It is low for minimal farming conditions. It is medium for high-standard farming conditions. Our conclusion is based on a medium amount of evidence.6 Aggression
There is a range of adverse reactions in species, spanning from being relatively indifferent towards others to defending valuable resources (e.g., food, territory, mates) to actively attacking opponents.
What is the probability of the species being non-aggressive and non-territorial in captivity?
It is low for minimal farming conditions. It is medium for high-standard farming conditions. Our conclusion is based on a medium amount of evidence.7 Substrate
Depending on where in the water column the species lives, it differs in interacting with or relying on various substrates for feeding or covering purposes (e.g., plants, rocks and stones, sand and mud, turbidity).
What is the probability of providing the species' substrate and shelter needs in captivity?
It is low for minimal farming conditions. It is medium for high-standard farming conditions. Our conclusion is based on a medium amount of evidence.8 Stress
Farming involves subjecting the species to diverse procedures (e.g., handling, air exposure, short-term confinement, short-term crowding, transport), sudden parameter changes or repeated disturbances (e.g., husbandry, size-grading).
What is the probability of the species not being stressed?
It is low for minimal farming conditions. It is medium for high-standard farming conditions. Our conclusion is based on a medium amount of evidence.9 Malformations
Deformities that – in contrast to diseases – are commonly irreversible may indicate sub-optimal rearing conditions (e.g., mechanical stress during hatching and rearing, environmental factors unless mentioned in crit. 3, aquatic pollutants, nutritional deficiencies) or a general incompatibility of the species with being farmed.
What is the probability of the species being malformed rarely?
It is unclear for minimal and high-standard farming conditions. Our conclusion is based on a low amount of evidence.10 Slaughter
The cornerstone for a humane treatment is that slaughter a) immediately follows stunning (i.e., while the individual is unconscious), b) happens according to a clear and reproducible set of instructions verified under farming conditions, and c) avoids pain, suffering, and distress.
What is the probability of the species being slaughtered according to a humane slaughter protocol?
It is low for minimal farming conditions. It is medium for high-standard farming conditions. Our conclusion is based on a medium amount of evidence.Side note: Domestication
Teletchea and Fontaine introduced 5 domestication levels illustrating how far species are from having their life cycle closed in captivity without wild input, how long they have been reared in captivity, and whether breeding programmes are in place.
What is the species’ domestication level?
DOMESTICATION LEVEL 5 83, fully domesticated.
Side note: Forage fish in the feed
450-1,000 milliard wild-caught fishes end up being processed into fish meal and fish oil each year which contributes to overfishing and represents enormous suffering. There is a broad range of feeding types within species reared in captivity.
To what degree may fish meal and fish oil based on forage fish be replaced by non-forage fishery components (e.g., poultry blood meal) or sustainable sources (e.g., soybean cake)?
All age classes: WILD: carnivorous 35 84 85 86 87. FARM: for PARR in fresh water 88 and for SMOLTS in sea water 89, fish meal may be partly* replaced by sustainable sources; for PARR in fresh water, fish oil may be partly* 90 to mostly* replaced 91.
* partly = <51% – mostly = 51-99% – completely = 100%
Glossary
ALEVINS = larvae until the end of yolk sac absorption, for details ➝ Findings 10.1 Ontogenetic development
ANADROMOUS = migrating from the sea into fresh water to spawn
BENTHIC = living at the bottom of a body of water, able to rest on the floor
DOMESTICATION LEVEL 5 = selective breeding programmes are used focusing on specific goals 83
FARM = setting in farming environment or under conditions simulating farming environment in terms of size of facility or number of individuals
FRY = larvae from external feeding on, for details ➝ Findings 10.1 Ontogenetic development
IND = individuals
LAB = setting in laboratory environment
PARR = juvenile stage in rivers, for details ➝ Findings 10.1 Ontogenetic development
PHOTOPERIOD = duration of daylight
SMOLTS = juvenile stage migrating to the sea, for details ➝ Findings 10.1 Ontogenetic development
SPAWNERS = adults during the spawning season; in farms: adults that are kept as broodstock
WILD = setting in the wild
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