European perch

Perca fluviatilis

Perca fluviatilis (European perch)
Taxonomy
    • Osteichthyes
      • Perciformes
        • Percidae
          • Perca fluviatilis
Distribution
Distribution map: Perca fluviatilis (European perch)

Information


Authors: Maria Filipa Castanheira, Jenny Volstorf
Version: 2.0 (2022-01-22)

Cite

Reviewer: Pablo Arechavala-Lopez
Editor: Billo Heinzpeter Studer

Cite as: »Castanheira, Maria Filipa, and Jenny Volstorf. 2022. Perca fluviatilis (Farm: Short Profile). In: FishEthoBase, ed. Fish Ethology and Welfare Group. World Wide Web electronic publication. First published 2016-10-06. Version 2.0. https://fishethobase.net.«





FishEthoScore/farm

Perca fluviatilis
LiPoCe
Criteria
Home range
Depth range
Migration
Reproduction
Aggregation
Aggression
Substrate
Stress
Malformations
Slaughter


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)

Legend

High
Medium
Low
Unclear
No findings



General remarks

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.

Likelihood
Potential
Certainty

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.

Likelihood
Potential
Certainty

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.

Adults: Caught at 0.5-12 m within spawning season 13 15. No data found yet on depth of spawning culture conditions.




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?

There are unclear findings for minimal and high-standard farming conditions. Our conclusion is based on a low amount of evidence.

Likelihood
Potential
Certainty

Eggs and larvae: stationary 10.

Juveniles: no data found yet.

Adults: may migrate before spawning 18 19. Further research needed to determine migration behaviour. 

Adults: no data found yet on migration behaviour within spawning season.




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?

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.

Likelihood
Potential
Certainty

Adults: In the wild, spawning in winter-spring 13 20 21. Tanks: Temperature and PHOTOPERIOD manipulation to adjust reproduction time 8. Eggs are manually extracted by stripping 8




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?

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.

Likelihood
Potential
Certainty

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, adults: live in schools 23 13 24 and shoals 25 26 27 28. Further research needed to determine extension of shoals and schools in the wild.

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 m3. Intensive conditions: Tanks: 1.6-3 kg/m29.

Adults: live in schools within spawning season 13. Further research needed to determine extension of schools in the wild. Spawning tanks: Up to 20 kg/m3 8




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?

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.

Likelihood
Potential
Certainty

Larvae: In the wild, no aggressive interactions 22, cannibalistic incidences 30

Juveniles, adults: In the wild, cannibalistic incidences 23 30 9 31 32 33. In the lab, aggressive in groups of 3 34 and 4 35, consistent personality traits (bold/shy) 27 36

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.




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?

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.

Likelihood
Potential
Certainty

Eggs: attached to substrate 13 39 15 21. Larvae: Pelagic 1: Independent of bottom substrate. No data found yet on behaviour under farming conditions.

Juveniles: usually found on rocky and plants beds 30 9 34 40. No data found yet on behaviour under farming conditions.

Adults: attach eggs to gravel 15, macrophytes 13 15, tree roots 15, branches 15 41. Tanks: Tree branches as spawning substrate improve condition of spawners 2.



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 high amount of evidence.

Likelihood
Potential
Certainty

Larvae: No data found yet.

Juveniles: Stressed by confinement 42 and handling 43 44 45 46 47 48

Adults: No data found yet on stress in adults kept for fattening. During spawning season, handling stress caused 0-10% mortality in males, 15-17% in females 2.




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 farming conditions. It is medium for high-standard farming conditions. Our conclusion is based on a high amount of evidence.

Likelihood
Potential
Certainty

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.




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?

There are no findings for minimal and high-standard farming conditions.

Likelihood
Potential
Certainty

Common slaughter method: no data found yet. High-standard slaughter method: no data found yet.




11  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 4 49 50, level 5 being fully domesticated. Cultured since 1950 51.




12  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.

Juveniles: carnivorous and piscivorous, mainly zooplankton as juveniles, increasing proportion of fish with increasing age 30 9 15 33

Adults: carnivorous and piscivorous 30 9 15 33.

For all age classes, no data found yet on replacement of fish meal and fish oil.

 




Glossary


PHOTOPERIOD = duration of daylight
DOMESTICATION LEVEL 4 = entire life cycle closed in captivity without wild inputs 49



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