Version: B | 1.1 (2022-01-22)
Please note: This part of the profile is currently being revised.
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
FishEthoScore = Sum of criteria scoring "High" (max. 10)
The production of Perca fluviatilis has emerged over the past decades while important biological processes of the species are not known yet. The low FishEthoScore is mainly due to this big gap of knowledge in several characteristics, such as the dependence on fish in the diet, home and depth needs and needs of substrate. Tanks or raceways will most probably not fulfill space needs in intensive conditions. Further research is needed on both natural behaviour and physiological effects of farming practices in order to provide recommendations for improving fish welfare.
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?There are unclear findings for minimal farming conditions. It is medium for high-standard farming conditions. Our conclusion is based on a low amount of evidence.
Eggs and larvae: Pelagic 1: Inhabit the water column, independent of bottom and shore. Further research needed on home range. Incubation containers in ponds: 100-4000 L 2; cages for floating eggs: 0.4 x 0.4 x 0.4 m 3; intensive conditions: 300 L to several m3 dependent on the farming conditions 3.
Juveniles, adults: Pelagic 4 5 6: Inhabit the water column, independent of bottom and shore; site fidelity 7. Further research needed on home range. Extensive conditions: Ponds: 0.1-0.8 hectares 3. Semi-intensive conditions done on a pilot scale: Tanks: ca 3 x 3 x 0.5 m 3.
Adults: no data found yet on home range within the spawning season. Spawning tanks: 1.6 m3 8.
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?There are unclear findings for minimal farming conditions. It is medium for high-standard farming conditions. Our conclusion is based on a high amount of evidence.
Eggs and larvae: Usually 0-2 m 9 10; diel vertical shifting (deeper by night and dawn) 11. Extensive conditions: Ponds: 1.5 m 3. Semi-intensive conditions done on a pilot scale: Tanks: 50 cm 3. Further research needed on depth under intensive farming conditions.
Juveniles, adults: Caught at 0.5-12 m 12 13 9 14 15 16; seasonal vertical shifting into deeper water 17 7 11. Extensive conditions: Ponds: 1.5 m 3. Semi-intensive conditions done on a pilot scale: Tanks: 50 cm 3. Further research needed on depth under intensive farming conditions.
Some species undergo seasonal changes of environments for different purposes (feeding, spawning, etc.) and with them, environmental parameters (photoperiod, temperature, salinity) may change, too. What is the probability of providing farming conditions that are compatible with the migrating or habitat-changing behaviour of the species?There are unclear findings for minimal and high-standard farming conditions. Our conclusion is based on a low amount of evidence.
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?It is low for minimal farming conditions. It is high for high-standard farming conditions. Our conclusion is based on a medium amount of evidence.
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?There are unclear findings for minimal farming conditions. It is medium for high-standard farming conditions. Our conclusion is based on a low amount of evidence.
Eggs and larvae: live in shoals 22. Further research needed to determine extension of shoals in the wild. Extensive conditions: 10,000-60,000 eyed eggs/100 m2 3. Semi-intensive conditions: 500-4,000 eggs/100 m2 3. Intensive conditions: Tanks: Usually 20-50 larvae/L 3.
Juveniles: extensive conditions: Ponds: 1,000-5,000 juveniles of 0.5-1.5 g each in 100 m2 3. Semi-intensive conditions: Tanks: 500-4,000 individuals/100 m2 3. Intensive conditions: Tanks: 1.6-3 kg/m3 29.
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?There are unclear findings for minimal farming conditions. It is medium for high-standard farming conditions. Our conclusion is based on a medium amount of evidence.
Juveniles: In the lab, no food competition in groups of 4 37.
Adults: no data found yet on aggression behaviour in the wild within the spawning season. In the lab, no aggression recorded during courtship 38.
For all age classes, no data found yet on aggression behaviour under farming conditions.
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). What is the probability of providing the species' substrate and shelter needs in captivity?There are unclear findings for minimal farming conditions. It is high for high-standard farming conditions. Our conclusion is based on a high amount of evidence.
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 high amount of evidence.
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?There are unclear findings for minimal farming conditions. It is medium for high-standard farming conditions. Our conclusion is based on a high amount of evidence.
Eggs and larvae: initially rearing in ponds and feeding natural food before transferring to tanks reduces frequency of skeletal and other deformities compared to sole tank culture 3.
Juveniles and adults: initially rearing in ponds and feeding natural food before transferring to tanks reduces frequency of skeletal and other deformities compared to sole tank culture 3.
Adults: no data found yet on frequency of malformations under farming conditions.
For all age classes, no data found yet on frequency of malformations in the wild.
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?There are no findings for minimal and high-standard farming conditions.
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?
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)?
Larvae: no data found yet on feed in the wild.
For all age classes, no data found yet on replacement of fish meal and fish oil.
PHOTOPERIOD = duration of daylight
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