Information
Version: B | 1.1 (2022-08-17)
Please note: This part of the profile is currently being revised.
FishEthoScore/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
FishEthoScore = Sum of criteria scoring "High" (max. 10)
General remarks
Barbonymus schwanenfeldii is a freshwater fish naturally inhabiting Mekong and Chao Phraya basins besides Malay Peninsula, Sumatra, and Borneo in Asia, but it was already introduced in the south-east of the USA, Philippines, Indonesia, and Ivory Coast. It is a tropical BENTHOPELAGIC barb that can be found in streams, canals, ditches, flooded fields, lakes, and especially in medium- to large-sized rivers. B. schwanenfeldii is considered omnivorous, but mainly herbivorous. It is commercially important for the ornamental fish trade and occasionally used as bait. It is a promising species for aquaculture due to its good meat taste and low trophic level. However, this barb apparently is not much domesticated yet: ADULTS are taken from the wild to become SPAWNERS, for example. Besides that, further research about important wild information of this fish is still missing, especially about home range, aggregation densities, reproduction, and substrate use. Relevant information to better assess farming conditions of this barb is also missing, especially about its stress response and malformation rates in captivity. A humane slaughter protocol still remains to be established. Together, this missing data makes it difficult to assess and improve the welfare conditions of B. schwanenfeldii.
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 and high-standard farming conditions. Our conclusion is based on a medium 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 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?
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.


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 theses 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 high for minimal and high-standard farming conditions. Our conclusion is based on a low 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 high for minimal and high-standard farming conditions. Our conclusion is based on a low 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). 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 low 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?
There are no findings for minimal and high-standard farming conditions.


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?
There are unclear findings 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 low 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 3 25, level 5 being 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: omnivorours 26 27 28-20 22-11 11 – mainly herbivorous 22-11, being considered detritivorous 26 28-20. FARM: feed on cassava and Passiflora leaves efficiently, but better growth with commercial feed 8. High protein diet (32%) is better for growth 9. LAB: high protein diet (32%) is better for growth 18.
Glossary
BENTHOPELAGIC = living and feeding near the bottom of a body of water, floating above the floor
DOMESTICATION LEVEL 3 = entire life cycle closed in captivity with wild inputs 25
FARM = setting in farming environment or under conditions simulating farming environment in terms of size of facility or number of individuals
FINGERLINGS = early juveniles with fully developed scales and working fins, the size of a human finger; for details ➝ Findings 10.1 Ontogentic development
FRY = larvae from external feeding on, for details ➝ Findings 10.1 Ontogenetic development
IND = individuals
JUVENILES = fully developed but immature individuals, for details ➝ Findings 10.1 Ontogenetic development
LAB = setting in laboratory environment
LARVAE = hatching to mouth opening, for details ➝ Findings 10.1 Ontogenetic development
NTU = Nephelometric Turbidity Units
PHOTOPERIOD = duration of daylight
POTAMODROMOUS = migrating within fresh water
SPAWNERS = adults during the spawning season; in farms: adults that are kept as broodstock
WILD = setting in the wild
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