Information
Version: B | 1.2 (2024-12-31)
- minor editorial changes plus new side note "Commercial relevance"
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
Solea senegalensis is a BENTHIC, predominantly littoral, species, generally inhabiting sandy or muddy bottoms and occurring along the eastern Atlantic from the Gulf of Biscay to the coasts of Senegal, less frequently in the Western Mediterranean. During the last decades, particularly in Spain and in Portugal, an interest in the cultivation of S. senegalensis in aquaculture has emerged due to its high commercial value, potential to be reared in polyculture systems, and better aptitude for growth in captivity than its apparently close relative S. solea. However, before a reliable technology for production in good welfare conditions can be developed, several aspects of its culture still need to be solved and optimised such as the importance of sandy substrate, stress susceptibility, malformation, and slaughter.
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 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 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 high for minimal and 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 unclear 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 unclear 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 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 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 348, 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 49. FARM: fish meal and fish oil may be partly* replaced by non-forage fishery components 505152535455.
*partly = <51% – mostly = 51-99% – completely = 100%
Side note: Commercial relevance
How much is this species farmed annually?
1,511 t/year 1990-2019 amounting to estimated 4,000,000 IND/year 1990-2019 56.
Glossary
BENTHIC = living at the bottom of a body of water, able to rest on the floor
DOMESTICATION LEVEL 3 = entire life cycle closed in captivity with wild inputs 48
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
LAB = setting in laboratory environment
LARVAE = hatching to mouth opening
PELAGIC = living independent of bottom and shore of a body of water
SPAWNERS = adults during the spawning season; in farms: adults that are kept as broodstock
WILD = setting in the wild
Bibliography
2 Imsland, A. K., A. Foss, L. E. C. Conceição, M. T. Dinis, D. Delbare, E. Schram, A. Kamstra, P. Rema, and P. White. 2003. A review of the culture potential of Solea solea and S. senegalensis. Reviews in Fish Biology and Fisheries 13: 379–408. https://doi.org/10.1007/s11160-004-1632-6.
3 Dinis, Maria Teresa, Laura Ribeiro, Florbela Soares, and Carmen Sarasquete. 1999. A review on the cultivation potential of Solea senegalensis in Spain and in Portugal. Aquaculture 176: 27–38. https://doi.org/10.1016/S0044-8486(99)00047-2.
4 Abecasis, D, P Afonso, and K Erzini. 2014. Combining multispecies home range and distribution models aids assessment of MPA effectiveness. Marine Ecology Progress Series 513: 155–169. https://doi.org/10.3354/meps10987.
5 Øiestad, V. 1999. Shallow raceways as a compact, resource-maximizing farming procedure for marine fish species. Aquaculture Research 30: 831–840. https://doi.org/10.1046/j.1365-2109.1999.00408.x.
6 Colen, R, A Ramalho, F Rocha, and M T Dinis. 2014. Cultured Aquatic Species Information Programme. Solea solea. Rome: FAO Fisheries and Aquaculture Department.
7 Cabral, Henrique, and Maria Jose Costa. 1999. Differential use of nursery areas within the Tagus estuary by sympatric soles, Solea solea and Solea senegalensis. Environmental Biology of Fishes 56: 389–397.
8 FAO. 2017. FAO Fisheries & Aquaculture - Species Fact Sheets - Solea solea (Quensel, 1806). World Wide Web electronic publication. www.fao.org.
9 Desoutter, M. 1990. Check-list of the fishes of the eastern tropical Atlantic (CLOFETA). In Soleidae. p. 1037-1049. In J.C. Quero, J.C. Hureau, C. Karrer, A. Post and L. Saldanha (eds.). Vol. 2. Lisbon; SEI, Paris; and UNESCO, Paris: JNICT.
10 Vinagre, Catarina, Vanessa Fonseca, Henrique Cabral, and Maria José Costa. 2006. Habitat suitability index models for the juvenile soles, Solea solea and Solea senegalensis, in the Tagus estuary: Defining variables for species management. Fisheries Research 82: 140–149. https://doi.org/10.1016/j.fishres.2006.07.011.
11 Cerqueira, M. 2017. Personal communication.
12 Vinagre, Catarina, Anabela Maia, Rachid Amara, and Henrique N. Cabral. 2013. Spawning period of Senegal sole, Solea senegalensis, based on juvenile otolith microstructure. Journal of Sea Research 76: 89–93. https://doi.org/10.1016/j.seares.2012.11.004.
13 Carazo, Ignacio, Olvido Chereguini, Ignacio Martín, Felicity Huntingford, and Neil Duncan. 2016. Reproductive ethogram and mate selection in captive wild Senegalese sole (Solea senegalensis). Spanish Journal of Agricultural Research 14: 0401. https://doi.org/10.5424/sjar/2016144-9108.
14 Anguis, V., and J. P. Cañavate. 2005. Spawning of captive Senegal sole (Solea senegalensis) under a naturally fluctuating temperature regime. Aquaculture 243: 133–145. https://doi.org/10.1016/j.aquaculture.2004.09.026.
15 Oliveira, C., M. T. Dinis, F. Soares, E. Cabrita, P. Pousão-Ferreira, and F. J. Sánchez-Vázquez. 2009. Lunar and daily spawning rhythms of Senegal sole Solea senegalensis. Journal of Fish Biology 75: 61–74. https://doi.org/10.1111/j.1095-8649.2009.02263.x.
16 Martín, Ignacio, Ignacio Carazo, Inmaculada Rasines, Cristina Rodríguez, Raquel Fernández, Paulino Martínez, Fernando Norambuena, Olvido Cherenguini, and Neil Duncan. 2019. Reproductive performance of captive Senegalese sole, Solea senegalensis, according to the origin (wild or cultured) and gender. Spanish Journal of Agricultural Research 17: 11. https://doi.org/10.5424/sjar/2019174-14953.
17 Chauvigné, François, Wendy González, Sandra Ramos, Carla Ducat, Neil Duncan, Ignacio Giménez, and Joan Cerdà. 2018. Seasonal-and dose-dependent effects of recombinant gonadotropins on sperm production and quality in the flatfish Solea senegalensis. Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology 225: 59–64. https://doi.org/10.1016/j.cbpa.2018.06.022.
18 García, J. García, and B. García García. 2006. An econometric viability model for ongrowing sole (Solea senegalensis) in tanks using pumped well sea water. Spanish Journal of Agricultural Research 4: 304–315. https://doi.org/10.5424/sjar/2006044-208.
19 Salas-Leiton, E., V. Anguis, M. Manchado, and J. P. Cañavate. 2008. Growth, feeding and oxygen consumption of Senegalese sole (Solea senegalensis) juveniles stocked at different densities. Aquaculture 285: 84–89. https://doi.org/10.1016/j.aquaculture.2008.08.001.
20 Andrade, Tiago, António Afonso, Amalia Pérez-Jiménez, Aires Oliva-Teles, Verónica de las Heras, Juan Miguel Mancera, Renata Serradeiro, and Benjamín Costas. 2015. Evaluation of different stocking densities in a Senegalese sole (Solea senegalensis) farm: Implications for growth, humoral immune parameters and oxidative status. Aquaculture 438: 6–11. https://doi.org/10.1016/j.aquaculture.2014.12.034.
21 Silva, Patrícia Isabel Mota, Catarina I. M. Martins, Sofia Engrola, Giovanna Marino, Øyvind Øverli, and Luis E. C. Conceição. 2010. Individual differences in cortisol levels and behaviour of Senegalese sole (Solea senegalensis) juveniles: Evidence for coping styles. Applied Animal Behaviour Science 124: 75–81. https://doi.org/10.1016/j.applanim.2010.01.008.
22 Castanheira, Maria Filipa. 2017. Personal communication.
23 García-López, Ángel, Emilio Pascual, Carmen Sarasquete, and Gonzalo Martínez-Rodríguez. 2006. Disruption of gonadal maturation in cultured Senegalese sole Solea senegalensis Kaup by continuous light and/or constant temperature regimes. Aquaculture 261: 789–798. https://doi.org/10.1016/j.aquaculture.2006.09.005.
24 Villanueva, J.L.R., and J. B. P. Alonso. Cultivo del lenguado senegalés (Solea senegalensis). FUNDACIÓN OBSERVATORIO ESPAÑOL DE ACUICULTURA 2014.
25 Cabrita, E., F. Soares, and M. T. Dinis. 2006. Characterization of Senegalese sole, Solea senegalensis, male broodstock in terms of sperm production and quality. Aquaculture 261: 967–975. https://doi.org/10.1016/j.aquaculture.2006.08.020.
26 García-López, Ángel, Elsa Couto, Adelino V. M. Canario, Carmen Sarasquete, and Gonzalo Martínez-Rodríguez. 2007. Ovarian development and plasma sex steroid levels in cultured female Senegalese sole Solea senegalensis. Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology 146: 342–354. https://doi.org/10.1016/j.cbpa.2006.11.014.
27 Guzmán, José M., Birgitta Norberg, Jesús Ramos, Constantinos C. Mylonas, and Evaristo L. Mañanós. 2008. Vitellogenin, steroid plasma levels and spawning performance of cultured female Senegalese sole (Solea senegalensis). General and Comparative Endocrinology 156: 285–297. https://doi.org/10.1016/j.ygcen.2008.02.002.
28 Solé, M., J. Potrykus, C. Fernández-Díaz, and J. Blasco. 2004. Variations on stress defences and metallothionein levels in the Senegal sole, Solea senegalensis, during early larval stages. Fish Physiology and Biochemistry 30: 57–66. https://doi.org/10.1007/s10695-004-6786-6.
29 Fernández-Díaz, C., J. Kopecka, J. P. Cañavate, C. Sarasquete, and M. Solé. 2006. Variations on development and stress defences in Solea senegalensis larvae fed on live and microencapsulated diets. Aquaculture 251: 573–584. https://doi.org/10.1016/j.aquaculture.2005.06.014.
30 Martins, Dulce Alves, Filipa Rocha, Filipa Castanheira, Ana Mendes, Pedro Pousão-Ferreira, Narcisa Bandarra, Joana Coutinho, et al. 2013. Effects of dietary arachidonic acid on cortisol production and gene expression in stress response in Senegalese sole (Solea senegalensis) post-larvae. Fish Physiology and Biochemistry 39: 1223–1238. https://doi.org/10.1007/s10695-013-9778-6.
31 Costas, Benjamín, Cláudia Aragão, Juan Miguel Mancera, Maria Teresa Dinis, and Luís E C Conceição. 2008. High stocking density induces crowding stress and affects amino acid metabolism in Senegalese sole Solea senegalensis (Kaup 1858) juveniles. Aquaculture Research 39: 1–9. https://doi.org/10.1111/j.1365-2109.2007.01845.x.
32 Wunderink, Yvette S., Steef Engels, Silke Halm, Manuel Yúfera, Gonzalo Martínez-Rodríguez, Gert Flik, Peter H. M. Klaren, and Juan M. Mancera. 2011. Chronic and acute stress responses in Senegalese sole (Solea senegalensis): The involvement of cortisol, CRH and CRH-BP. General and Comparative Endocrinology 171: 203–210. https://doi.org/10.1016/j.ygcen.2011.01.010.
33 Aragão, C., J. Corte-Real, B. Costas, M. T. Dinis, and L. E. C. Conceição. 2008. Stress response and changes in amino acid requirements in Senegalese sole (Solea senegalensis Kaup 1858). Amino Acids 34: 143–148. https://doi.org/10.1007/s00726-007-0495-2.
34 Costas, Benjamín, Luís E. C. Conceição, Cláudia Aragão, Juan A. Martos, Ignacio Ruiz-Jarabo, Juan M. Mancera, and António Afonso. 2011. Physiological responses of Senegalese sole (Solea senegalensis Kaup, 1858) after stress challenge: Effects on non-specific immune parameters, plasma free amino acids and energy metabolism. Aquaculture 316: 68–76. https://doi.org/10.1016/j.aquaculture.2011.03.011.
35 Costas, Benjamín, Cláudia Aragão, José L. Soengas, Jesús M. Míguez, Paulo Rema, Jorge Dias, António Afonso, and Luís E. C. Conceição. 2012. Effects of dietary amino acids and repeated handling on stress response and brain monoaminergic neurotransmitters in Senegalese sole (Solea senegalensis) juveniles. Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology 161: 18–26. https://doi.org/10.1016/j.cbpa.2011.08.014.
36 Weber, R. A., J. J. Pérez Maceira, M. J. Aldegunde, J. B. Peleteiro, L. O. García Martín, and M. Aldegunde. 2015. Effects of acute handling stress on cerebral monoaminergic neurotransmitters in juvenile Senegalese sole Solea senegalensis. Journal of Fish Biology 87: 1165–1175. https://doi.org/10.1111/jfb.12774.
37 Arjona, F. J., L. Vargas-Chacoff, M. P. Martín del Río, G. Flik, J. M. Mancera, and P. H. M. Klaren. 2008. The involvement of thyroid hormones and cortisol in the osmotic acclimation of Solea senegalensis. General and Comparative Endocrinology 155: 796–803. https://doi.org/10.1016/j.ygcen.2007.09.007.
38 Costas, Benjamín, Cláudia Aragão, Ignacio Ruiz-Jarabo, Luis Vargas-Chacoff, Francisco Jesús Arjona, Maria Teresa Dinis, Juan Miguel Mancera, and Luís E. C. Conceição. 2011. Feed deprivation in Senegalese sole (Solea senegalensis Kaup, 1858) juveniles: effects on blood plasma metabolites and free amino acid levels. Fish Physiology and Biochemistry 37: 495–504. https://doi.org/10.1007/s10695-010-9451-2.
39 Martins, Catarina I. M., Maria F. Castanheira, Sofia Engrola, Benjamín Costas, and Luís E. C. Conceição. 2011. Individual differences in metabolism predict coping styles in fish. Applied Animal Behaviour Science 130: 135–143. https://doi.org/10.1016/j.applanim.2010.12.007.
40 Ibarra-Zatarain, Z., E. Fatsini, S. Rey, O. Chereguini, I. Martin, I. Rasines, C. Alcaraz, and N. Duncan. 2016. Characterization of stress coping style in Senegalese sole (Solea senegalensis) juveniles and breeders for aquaculture. Open Science 3: 160495. https://doi.org/10.1098/rsos.160495.
41 Gavaia, P. J, M. T Dinis, and M. L Cancela. 2002. Osteological development and abnormalities of the vertebral column and caudal skeleton in larval and juvenile stages of hatchery-reared Senegal sole (Solea senegalensis). Aquaculture 211: 305–323. https://doi.org/10.1016/S0044-8486(02)00167-9.
42 Engrola, S., L. E. C. Conceicao, P. J. Gavaia, M. L. Cancela, and M. T. Dinis. 2005. Effects of pre-weaning feeding frequency on growth, survival, and deformation of Senegalese sole, Solea senegalensis (Kaup, 1858). Israeli journal of aquaculture - Bamidgeh.
43 Gavaia, Paulo J., Dina C. Simes, J. B. Ortiz-Delgado, Carla S. B. Viegas, Jorge P. Pinto, Robert N. Kelsh, M. Carmen Sarasquete, and M. Leonor Cancela. 2006. Osteocalcin and matrix Gla protein in zebrafish (Danio rerio) and Senegal sole (Solea senegalensis): comparative gene and protein expression during larval development through adulthood. Gene expression patterns: GEP 6: 637–652. https://doi.org/10.1016/j.modgep.2005.11.010.
44 Fernández, Ignacio, Marta S. Pimentel, Juan B. Ortiz-Delgado, Francisco Hontoria, Carmen Sarasquete, Alicia Estévez, Jose Luis Zambonino-Infante, and Enric Gisbert. 2009. Effect of dietary vitamin A on Senegalese sole (Solea senegalensis) skeletogenesis and larval quality. Aquaculture 295: 250–265. https://doi.org/10.1016/j.aquaculture.2009.06.046.
45 Villalta, Mireia, Alicia Estévez, and Matthew P. Bransden. 2005. Arachidonic acid enriched live prey induces albinism in Senegal sole (Solea senegalensis) larvae. Aquaculture 245: 193–209. https://doi.org/10.1016/j.aquaculture.2004.11.035.
46 Soares, F., Sofia Engrola, and M. T. Dinis. 2002. Anomalías en la pigmentación de juveniles de lenguado Solea senegalensis Kaup, 1858. Boletín del Instituto Español de Oceanografía 2002, 18 (1-4): 405-407: 405–407.
47 Ribas, L., R. Flos, L. Reig, S. MacKenzie, B. A. Barton, and L. Tort. 2007. Comparison of methods for anaesthetizing Senegal sole (Solea senegalensis) before slaughter: Stress responses and final product quality. Aquaculture 269: 250–258. https://doi.org/10.1016/j.aquaculture.2007.05.036.
48 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.
49 Cabral, H. N. 2000. Comparative feeding ecology of sympatric Solea solea and S. senegalensis, within the nursery areas of the Tagus estuary, Portugal. Journal of Fish Biology 57: 1550–1562. https://doi.org/10.1111/j.1095-8649.2000.tb02231.x.
50 Silva, Joana M G, Marit Espe, Luís E C Conceição, Jorge Dias, Benjamin Costas, and Luísa M P Valente. 2010. Feed intake and growth performance of Senegalese sole (Solea senegalensis Kaup, 1858) fed diets with partial replacement of fish meal with plant proteins. Aquaculture Research 41: e20–e30. https://doi.org/10.1111/j.1365-2109.2009.02451.x.
51 Cabral, E. M., M. Bacelar, S. Batista, M. Castro-Cunha, R. O. A. Ozório, and L. M. P. Valente. 2011. Replacement of fishmeal by increasing levels of plant protein blends in diets for Senegalese sole (Solea senegalensis) juveniles. Aquaculture 322: 74–81. https://doi.org/10.1016/j.aquaculture.2011.09.023.
52 Benítez-Dorta, Vanessa, María J. Caballero, Marisol Izquierdo, Manuel Manchado, Carlos Infante, María J. Zamorano, and Daniel Montero. 2013. Total substitution of fish oil by vegetable oils in Senegalese sole (Solea senegalensis) diets: effects on fish performance, biochemical composition, and expression of some glucocorticoid receptor-related genes. Fish Physiology and Biochemistry 39: 335–349. https://doi.org/10.1007/s10695-012-9703-4.
53 Cabral, E. M., T. J. R. Fernandes, S. D. Campos, M. Castro-Cunha, M. B. P. P. Oliveira, L. M. Cunha, and L. M. P. Valente. 2013. Replacement of fish meal by plant protein sources up to 75% induces good growth performance without affecting flesh quality in ongrowing Senegalese sole. Aquaculture.
54 Borges, Pedro, Bruno Reis, Telmo J. R. Fernandes, Ângela Palmas, Manuela Castro-Cunha, Françoise Médale, Maria Beatriz P. P. Oliveira, and Luísa M. P. Valente. 2014. Senegalese sole juveniles can cope with diets devoid of supplemental fish oil while preserving flesh nutritional value. Aquaculture 418: 116–125. https://doi.org/10.1016/j.aquaculture.2013.10.014.
55 Reis, Bruno, Eduarda M. Cabral, Telmo J. R. Fernandes, Manuela Castro-Cunha, Maria Beatriz P. P. Oliveira, Luís M. Cunha, and Luísa M. P. Valente. 2014. Long-term feeding of vegetable oils to Senegalese sole until market size: Effects on growth and flesh quality. Recovery of fatty acid profiles by a fish oil finishing diet. Aquaculture 434: 425–433. https://doi.org/10.1016/j.aquaculture.2014.09.002.
56 Mood, Alison, Elena Lara, Natasha K. Boyland, and Phil Brooke. 2023. Estimating global numbers of farmed fishes killed for food annually from 1990 to 2019. Animal Welfare 32: e12. https://doi.org/10.1017/awf.2023.4.
