Information
Version: B | 1.1 (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
Acipenser ruthenus is the smallest of the sturgeon family. Its current populations are considered vulnerable, majorly due to overfishing and river disruption, and differ from the original in size and biology. Although there are farms rearing this species (many of them for repopulation purposes), it is farmed majorly interbred with Huso huso as 'bester'. There is lack of knowledge on its biology in the wild as well as under farming environment, where aspects such as aggregation, aggression, stress, and malformation rate remain undisclosed. A functional stunning and slaughter protocol remains to be established. Further research directed specifically to this species should be conducted to improve its present and prospective welfare state under farming conditions.
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 unclear for minimal farming conditions. It is medium for 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 and 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 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 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 unclear for minimal farming conditions. It is medium for 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, turbidity).
What is the probability of providing the species' substrate and shelter needs in captivity?
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.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 low for minimal farming conditions. It is medium for high-standard farming conditions. Our conclusion is based on a medium 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 high 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 4 30, 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: carnivorous 8 9 31. FARM: fish meal may be partly* replaced by non-forage fishery components 32. It is possible for sturgeon farms to produce live feeds for their reared fish 2.
*partly = <51% – mostly = 51-99% – completely = 100%
Glossary
DOMESTICATION LEVEL 4 = entire life cycle closed in captivity without wild inputs 30
FARM = setting in farming environment or under conditions simulating farming environment in terms of size of facility or number of individuals
IND = individuals
JUVENILES = fully developed but immature individuals, for details ➝ Findings 10.1 Ontogenetic development
LARVAE = hatching to mouth opening, for details ➝ Findings 10.1 Ontogenetic development
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
Bibliography
2 Chebanov, Mikhail S., and Elena V. Galich. 2011. Sturgeon hatchery manual. FAO Fisheries and Aquaculture Technical Paper 558. Ankara: Food and Agriculture Organization of the United Nations.
3 Gerasimov, Yu V., and O. L. Vasyura. 2013. Growth and feeding of juvenile sterlet Acipenser ruthenus (Acipenseridae) in a pond after various durations of being preliminarily kept in tanks. Inland Water Biology 6: 228–235. https://doi.org/10.1134/S1995082913030073.
4 Chebanov, Mihail, and Roland Billard. 2001. The culture of sturgeons in Russia: production of juveniles for stocking and meat for human consumption. Aquatic Living Resources 14: 375–381. https://doi.org/10.1016/S0990-7440(01)01122-6.
5 Semenkova, Tatiana B., Adelino V.M. Canário, Liubov V. Bayunova, Elsa Couto, Nikolai N. Kolmakov, and Irina A. Barannikova. 2006. Sex steroids and oocyte maturation in the sterlet (Acipenser ruthenus L.). Journal of Applied Ichthyology 22: 340–345. https://doi.org/10.1111/j.1439-0426.2007.00981.x.
6 Zamaninia, Zeynab, Ameneh Azizi, Behrooz Heidari, and Mahvash Hadavi. 2017. Variations of Immune Parameters in the Early Life Stages and the Female Broodstock of the Cultured Persian Sturgeon, Acipenser persicus (Borodin 1897) and the Sterlet, Acipenser ruthenus (Linnaeus, 1758). Turkish Journal of Fisheries and Aquatic Sciences 17: 1017–1024.
7 Kalmykov, V. A., G. I. Ruban, and D. S. Pavlov. 2010. Migrations and resources of sterlet Acipenser ruthenus (Acipenseridae) from the lower reaches of the Volga River. Journal of Ichthyology 50: 44–51. https://doi.org/10.1134/S0032945210010066.
8 Fieszl, Jozsef, Elżbieta Bogacka-Kapusta, Andrzej Kapusta, Urszula Szymańska, and Andrzej Martyniak. 2011. Feeding ecology of sterlet Acipenser ruthenus L. in the Hungarian section of the Danube River. Archives of Polish Fisheries 19: 105–111. https://doi.org/10.2478/v10086-011-0012-9.
9 FAO. 2017. FAO Fisheries & Aquaculture - Species Fact Sheets - Acipenser ruthenus (Linnaeus, 1758). World Wide Web electronic publication. www.fao.org.
10 Lenhardt, M., P. Cakic, J. Kolarevic, and Z. Gacic. 2003. Morphometric recognition of two morphs in sterlet (Acipenser ruthenus) population induced by different reproductive behaviour. Journal of Fish Biology 63: 252–252. https://doi.org/10.1111/j.1095-8649.2003.216bf.x.
11 Holčík, Juraj. 1989. The Freshwater Fishes of Europe: General introduction to fishes ; Acipenseriformes. AULA - Verlag.
12 Bayrami, Abolfazl, Hamid Allaf Noverian, and Ehsan Asadi Sharif. 2017. Effects of background colour on growth indices and stress of young sterlet (Acipenser ruthenus) in a closed circulated system. Aquaculture Research 48: 2004–2011. https://doi.org/10.1111/are.13033.
13 Hensel, Karol, and Juraj Holcík. 1997. Past and current status of sturgeons in the upper and middle Danube River. In Sturgeon Biodiversity and Conservation, 185–200. Developments in Environmental Biology of Fishes. Springer, Dordrecht. https://doi.org/10.1007/0-306-46854-9_9.
14 Azarin, Hajar, Mohammad Sadegh Aramli, and Fatemeh Naderi. 2015. Selected coelomic fluid parameters of sterlet, Acipenser ruthenus L.: effects of light color and photoperiod. Archives of Polish Fisheries 22: 243–247. https://doi.org/10.2478/aopf-2014-0025.
15 Williot, P., R. Brun, T. Rouault, M. Pelard, D. Mercier, and A. Ludwig. 2005. Artificial spawning in cultured sterlet sturgeon, Acipenser ruthenus L., with special emphasis on hermaphrodites. Aquaculture 246: 263–273. https://doi.org/10.1016/j.aquaculture.2005.02.048.
16 Maltsev, SA. Conservation of the Sturgeon Fish in Lower Volga.
17 Horváth, L., A. Péteri, and J. Kouril. 1986. Successful sterlet, Acipenser ruthenus L., propagation with synthetic LH-RH hormone. Aquaculture Research 17: 113–116. https://doi.org/10.1111/j.1365-2109.1986.tb00091.x.
18 Falahatkar, B., and I. E. Komaee. 2011. Egg extraction of sterlet sturgeon (Acipenser ruthenus L.) through surgery. Journal of Veterinary Research 66: 349–379.
19 Kalmykov, V. A., G. I. Ruban, and D. S. Pavlov. 2009. On the populational structure of sterlet Acipenser ruthenus (Acipenseridae) from the Volga Lower reaches. Journal of Ichthyology 49: 339–347. https://doi.org/10.1134/S0032945209040067.
20 Kozłowski, Michał, Mirosław Szczepkowski, Krzysztof Wunderlich, Bożena Szczepkowska, and Iwona Piotrowska. 2014. Polyculture of juvenile pikeperch (Sander lucioperca (L.)) and sterlet (Acipenser ruthenus L.) in a recirculating system. Fisheries & Aquatic Life 22. https://doi.org/10.2478/aopf-2014-0024.
21 Anonymous farmers. 2018. Personal communication.
22 Khodorevskaya, R. P., G. I. Ruban, and D. S. Pavlov. 2009. Behaviour, migrations, distribution and stocks of sturgeons in the Volga-Caspian basin. World Sturgeon Conservation Society: Special Publication 3. Norder- stedt, Germany: Books on Demand GmbH.
23 Saraiva, João L. 2018. Personal communication.
24 Poleksic, Vesna, Mirjana Lenhardt, Ivan Jaric, Dragana Djordjevic, Zoran Gacic, Gorcin Cvijanovic, and Bozidar Raskovic. 2010. Liver, gills, and skin histopathology and heavy metal content of the Danube sterlet (Acipenser ruthenus Linnaeus, 1758). Environmental Toxicology and Chemistry 29: 515–521. https://doi.org/10.1002/etc.82.
25 Linhart, O, Wl Shelton, V Tučková, M Rodina, and Mam Siddique. 2016. Effects of Temperature on In Vitro Short-Term Storage of Sterlet Sturgeon (Acipenser Ruthenus) Ova. Reproduction in Domestic Animals 51: 165–170. https://doi.org/10.1111/rda.12661.
26 Tatina, M., R. Taati, M. Bahmani, M. Soltani, and M. Gharibkhani. 2012. Effect of acute stress on fluctuations of cortisol and glucose of sterlet (Acipenser ruthenus) fed with different levels of vitamins C and E. Journal of Aquatic Animals and Fisheries 2: 9–19.
27 Fopp-Bayat, D., K. Ocalewicz, M. Kucinski, M. Jankun, and B. Laczynska. 2017. Disturbances in the ploidy level in the gynogenetic sterlet Acipenser ruthenus. Journal of Applied Genetics 58: 373–380. https://doi.org/10.1007/s13353-017-0389-2.
28 Ghiasi, Sareh, Bahram Falahatkar, Murat Arslan, and Konrad Dabrowski. 2017. Physiological changes and reproductive performance of Sterlet sturgeon Acipenser ruthenus injected with thiamine. Animal Reproduction Science 178: 23–30. https://doi.org/10.1016/j.anireprosci.2017.01.005.
29 Williot, Patrick, Mikhail Chebanov, and Guy Nonnotte. 2018. Welfare in the Cultured Siberian Sturgeon, Acipenser baerii Brandt: State of the Art. In The Siberian Sturgeon (Acipenser baerii, Brandt, 1869) Volume 2 - Farming, 403–450. Springer, Cham. https://doi.org/10.1007/978-3-319-61676-6_19.
30 Teletchea, Fabrice, and Pascal Fontaine. 2012. Levels of domestication in fish: implications for the sustainable future of aquaculture. Fish and Fisheries 15: 181–195. https://doi.org/10.1111/faf.12006.
31 Strel’nikova, A. P. 2012. Feeding of juvenile sterlet (Acipenser ruthenus, Acipenseridae) in the Danube River midstream. Journal of Ichthyology 52: 85–90. https://doi.org/10.1134/S0032945212010110.
32 Ustaoglu, S., and B. Renner. 2006. Effects of partial replacement of fishmeal with isolated soy protein on digestibility and growth performance in sterlet (Acipenser ruthenus).
