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The Quintessence of Colour Enhancement in Ornamental Fishes:An Empirical Pathway Towards Rainbow Revolution


Affiliations
1 ICAR-Central Institute of Fisheries Education Versova, Mumbai 400 061, India
2 Taraporevala Marine Biological Research Station (Dr Balasaheb Sawant Konkan Krishi Vidyapeeth), Mumbai 400 051, India
 

One of the greatest challenges in the ornamental fish industry is to replicate accurate natural colour of fishes in captivity. Numerous attempts to preserve colour in captivity have been ineffective in reducing its fading, making it an important determinant in the selection of ornamental fish species for trade in terms of saturation, brightness and hue. Colour development of ornamental fishes has been widely studied, yielding curious insights about evolutionary genetics and having a discerning role, either as deceptive or attractive (aposematic) signals in mating as well as in camouflaging (Delphic) patterns during predator–prey interactions. This article discusses colour enhancement strategies with reference to nutritional interventions through carotenoid-rich feed ingredients, genetic manipulation or injection of colour in subcutaneous layers of the skin. An insight into the mechanism of pigmentation shows that motility and pigment dispersion of chromatophores are the two drivers by which fishes control integumentary colour variation. Research on colour development and its enhancement has witnessed novel techniques to support the ornamental fish industry. Therefore, this article also sheds light to answer questions on various issues pertaining to environmental and physiological effects on colouration. It attempts to provide insight on potential research areas, with caution on ethical and legal issues to ensure sustainability, so as to restrict risks of unwanted inheritance of colour patterns. It also highlights the problems of identity crisis among conspecifics thereby bringing a ‘rainbow revolution’ to the ornamental industry.

Keywords

Colour Enhancement, Chromatophore, Ornamental Fish, Rainbow Revolution.
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  • Jayalal, L. and Ramachandran, A., Export trend of Indian ornamental fish industry. Agric. Biol. J. N. Am., 2012, 3, 439–451.

  • Mendoza, R., Luna, S. and Aguilera, C., Risk assessment of the ornamental fish trade in Mexico: analysis of freshwater species and effectiveness of the fisk (fish invasiveness screening kit). Biol. Invas., 2015, 17, 3491–3502.

  • Green, E., International trade in marine aquarium species: using the global marine aquarium database. In Marine Ornamental Species: Collection, Culture and Conservation (eds Cato, J. C. and Brown, J. L.), Wiley, Iowa State Press, 2003, pp. 29–48.

  • Dee, L. E., Horii, S. S. and Thornhill, D. J., Conservation and management of ornamental coral reef wildlife: successes, shortcomings, and future directions. Biol. Conserv., 2014, 169, 225–237.

  • Leal, M. C., Vaz, M. C. M., Puga, J., Rocha, R. J. M., Brown, C., Rosa, R. and Calado, R., Marine ornamental fish imports in the European Union: an economic perspective. Fish Fish., 2016, 17, 459–468.

  • Sharp, S., Death by dyeing: About.Com (retrieved 19 May 2006).

  • Beyer, J., Bechmann, R., Taban, I., Aas, E., Reichert, W., Seljeskog, E. and Sanni, S., Biomarker measurements in long term exposures of a model fish to produced water components (PAHS and alkylphenols). Akvamiljø, Report AM-01/007, 2007, pp. 1–28.

  • Cal, L., Suarez-Bregua, P., Moran, P., Cerdá-Reverter, J. M. and Rotllant, J., Fish pigmentation. A key issue for the sustainable development of fish farming. In Emerging Issues in Fish Larvae Research (ed. Yufera, M.), Springer Nature, Switzerland, pp. 229– 252.

  • Sköld, H. N., Aspengren, S., Cheney, K. L. and Wallin, M., Fish chromatophores – from molecular motors to animal behavior. In International Review of Cell and Molecular Biology, Elsevier, 2016, vol. 321, pp. 171–219.

  • Ceinos, R. M., Guillot, R., Kelsh, R. N., Cerdá‐Reverter, J. M. and Rotllant, J., Pigment patterns in adult fish result from superimposition of two largely independent pigmentation mechanisms. Pigm. Cell Melanoma Res., 2015, 28, 196–209.

  • Kelsh, R. N., Sosa, K. C., Owen, J. P. and Yates, C. A., Zebrafish adult pigment stem cells are multipotent and form pigment cells by a progressive fate restriction process. BioEssays, 2017, 39.

  • Fujii, R., Correlation between fine structure and activity in fish melanophore. In Structure and Control of the Melanocyte (eds Della Porta, G. and Mühlbock, O.), Springer, 1966, pp. 114–123.

  • Fujii, R., Goda, M. and Oshima, N., Mechanism by which an elevation of extracellular glucide concentration induces pigment aggregation in medaka melanophores. Micros. Res. Tech., 2002, 58, 514–522.

  • Krauss, J., Frohnhöfer, H. G., Walderich, B., Maischein, H.-M., Weiler, C., Irion, U. and Nüsslein-Volhard, C., Endothelin signalling in iridophore development and stripe pattern formation of zebrafish. Biol. Open, 2014, 3, 503–509; https://bio.biologists.org/content/3/6/503.

  • Yamaguchi, M., Yoshimoto, E. and Kondo, S., Pattern regulation in the stripe of zebrafish suggests an underlying dynamic and autonomous mechanism. Proc. Natl. Acad. Sci. USA, 2007, 104, 4790–4793.

  • Sugimoto, M., Morphological color changes in fish: regulation of pigment cell density and morphology. Microsc. Res. Tech., 2002, 58, 496–503.

  • Cheney, K. L., Grutter, A. S. and Marshall, N. J., Facultative mimicry: cues for colour change and colour accuracy in a coral reef fish. Proc. R. Soc. London, Ser. B, 2008, 275, 117–122.

  • Kelley, J. L., Phillips, B., Cummins, G. H. and Shand, J., Changes in the visual environment affect colour signal brightness and shoaling behaviour in a freshwater fish. Anim. Behav., 2012, 83, 783–791.

  • Nilsson Sköld, H., Aspengren, S. and Wallin, M., Rapid color change in fish and amphibians – function, regulation, and emerging applications. Pigm. Cell Melanoma Res., 2013, 26, 29–38.

  • Svensson, P. A. and Wong, B., Carotenoid-based signals in behavioural ecology: a review. Behaviour, 2011, 148, 131–189.

  • Chatzifotis, S., Pavlidis, M., Jimeno, C. D., Vardanis, G., Sterioti, A. and Divanach, P., The effect of different carotenoid sources on skin coloration of cultured red porgy (Pagrus pagrus). Aquacult. Res., 2005, 36, 1517–1525.

  • Kuhn, R. and Lederer, E., Decomposition of carotene into its components. The growth vitamin. Part 1. Ber. Deutsch. Chem. Gesellsch., 1931, 64, 1349–1357.

  • Maoka, T., Carotenoids in marine animals. Mar. Drugs, 2011, 9, 278–293.

  • Goodwin, T. W., Carotenoids in fish. In The Biochemistry of Fish, Biochemical Society Symposia, USA, 1951.

  • Doolan, B. J., Allan, G. L., Booth, M. A. and Jones, P. L., Effect of carotenoids and background colour on the skin pigmentation of australian snapper Pagrus auratus (Bloch & Schneider, 1801). Aquacult. Res., 2008, 39, 1423–1433.

  • Ha, B.-S., Kang, D.-S., Kim, J.-H., Choi, O.-S. and Ryu, H.-Y., Metabolism of dietary carotenoids and effects to improve the body color of cultured flounder and red sea bream. Kor. J. Fish. Aquat. Sci., 1993, 26, 91–101.

  • Yasir, I. and Qin, J. G., Effect of dietary carotenoids on skin color and pigments of false clownfish, Amphiprion ocellaris, Cuvier. J. World Aquacult. Soc., 2010, 41, 308–318.

  • Hata, M., Carotenoid pigments in goldfish – IV. Carotenoid metabolism. Bull. Jpn. Soc. Sci. Fish., 1972, 38, 331–338.

  • Rahman, M. M., Khosravi, S., Chang, K. H. and Lee, S.-M., Effects of dietary inclusion of astaxanthin on growth, muscle pigmentation and antioxidant capacity of juvenile rainbow trout (Oncorhynchus mykiss). Prev. Nutr. Food Sci., 2016, 21, 281.

  • Amaya, E. and Nickell, D., Using feed to enhance the color quality of fish and crustaceans. In Feed and Feeding Practices in Aquaculture (ed. Allan Davis, D.), Elsevier, 2015, pp. 269–298.

  • Bjerkeng, B. and Berge, G., Apparent digestibility coefficients and accumulation of astaxanthin e/z isomers in Atlantic salmon (Salmo salar l.) and Atlantic halibut (Hippoglossus hippoglossus l.). Comp. Biochem. Physiol. Part B, 2000, 127, 423–432.

  • Brown, A. C., Leonard, H. M., McGraw, K. J. and Clotfelter, E. D., Maternal effects of carotenoid supplementation in an ornamented cichlid fish. Funct. Ecol., 2014, 28, 612–620.

  • Sefc, K. M., Brown, A. C. and Clotfelter, E. D., Carotenoid-based coloration in cichlid fishes. Comp. Biochem. Physiol. Part A, 2014, 173, 42–51.

  • McGraw, K. J. and Ardia, D. R., Carotenoids, immunocompetence, and the information content of sexual colors: an experimental test. Am. Nat., 2003, 162, 704–712.

  • Lozano, G. A., Carotenoids, parasites, and sexual selection. Oikos, 1994, 70, 309–311.

  • Andersson, S., Pryke, S. R., Örnborg, J., Lawes, M. J. and Andersson, M., Multiple receivers, multiple ornaments, and a trade-off between agonistic and epigamic signaling in a widowbird. Am. Nat., 2002, 160, 683–691.

  • Fitzpatrick, S., Colour schemes for birds: structural coloration and signals of quality in feathers. Ann. Zool. Fenn., 1998, 35, 67–77.

  • Cotton, S., Fowler, K. and Pomiankowski, A., Do sexual ornaments demonstrate heightened condition-dependent expression as predicted by the handicap hypothesis? Proc. R. Soc. London, Ser. B, 2004, 271, 771.

  • de Carvalho, C. C. and Caramujo, M. J., Carotenoids in aquatic ecosystems and aquaculture: a colorful business with implications for human health. Front. Mar. Sci., 2017, 4, 93.

  • Boonyaratpalin, M. and Lovell, R., Diet preparation for aquarium fishes. Aquaculture, 1977, 12, 53–62.

  • Boonyaratpalin, M. and Phromkunthong, W., Effects of carotenoid pigments from different sources on colour changes of fancy carp, Cyprinus carpio Linn. J. Sci. Technol., 1986, 8, 11–20.

  • Ako, H., Tamaru, C. S., Asano, L., Yuen, B. and Yamamoto, M., Achieving natural coloration in fish under culture. US–Japan Cooperative Program in Natural Resources Technical Report, No. 28, 2000, pp. 1–4.

  • Güroy, B., Şahin, İ., Mantoğlu, S. and Kayalı, S., Spirulina as a natural carotenoid source on growth, pigmentation and reproductive performance of yellow tail cichlid Pseudotropheus acei. Aquacult. Int., 2012, 20, 869–878.

  • Somanath, B. and Jasmin, K. J., Hibiscus petals and spirulina supplemented diet induced carotenoid changes in freshwater gold fish Carassius auratus. Int. J. Pure Appl. Zool., 2013, 4, 352–362.

  • Becker, W., Microalgae for aquaculture: the nutritional value of microalgae for aquaculture. In Handbook of Microalgal Culture: Biotechnology and Applied Phycology (ed. Richmond, A.), Blackwell, 2004, pp. 380–391.

  • Gupta, S., Jha, A., Pal, A. and Venkateshwarlu, G., Use of natural carotenoids for pigmentation in fishes. Indian J. Nat. Prod. Resour., 2014, 6(1), 46–49.

  • Valente, L. M. et al., Carotenoid deposition, flesh quality and immunological response of Nile tilapia fed increasing levels of imta-cultivated Ulva spp. J. Appl. Phycol., 2016, 28, 691–701.

  • Neamtu, G. and Simpson, K. L., Utilization of Adonis aestivalis as a dietary pigment source for rainbow trout Salmo gairdneri. Nippon Suisan Gakkaishi, 1990, 56, 783–788.

  • Shah, S. N. M., Shi-Lin, T., Gong, Z.-H. and Arisha, M. H., Studies on metabolism of capsanthin and its regulation under different conditions in pepper fruits (Capsicum spp.). Annu. Res. Rev. Biol., 2014, 4, 1106.

  • Wassef, E. A., Chatzifotis, S., Sakr, E. M. and Saleh, N. E., Effect of two natural carotenoid sources in diets for gilthead seabream, Sparus aurata, on growth and skin coloration. J. Appl. Aquacult., 2010, 22, 216–229.

  • Sinha, A. and Asimi, O. A., China rose (Hibiscus rosasinensis) petals: a potent natural carotenoid source for goldfish (Carassius auratus l.). Aquacult. Res., 2007, 38, 1123–1128.

  • Ramamoorthy, K., Bhuvaneswari, S., Sankar, G. and Sakkaravarthi, K., Proximate composition and carotenoid content of natural carotenoid sources and its colour enhancement on marine ornamental fish Amphiprion ocellaris (Cuveir 1880). World J. Fish Mar. Sci., 2010, 2, 545–550.

  • Sujatha, B. J. S., Shalin, J. J. and Palavesam, A., Influence of four ornamental flowers on the growth and colouration of orange sword tail Chicilidae fish (Xiphophorus hellerei, Heckel, 1940). Int. J. Biol. Med. Res., 2011, 2(3), 621–626.

  • Jha, G. N., Dar, B. A., Jha, T., Sarma, D. and Qureshi, T., Effect of spirulina and apple peel meal on growth performance, body composition and total carotenoids of snow trout (Schizothorax richardsonii). Indian J. Anim. Nutr., 2013, 30, 404–409.

  • Jagadeesh, T., Murthy, H. S., Surendranath, S., Panikkar, P., Manjappa, N. and Mahesh, V., Effects of supplementation of marigold (Tagetes erecta) oleoresin on growth, survival and pigmentation of rosy barb, Puntius conchonius (Hamilton). Int. Q. J. Life Sci., 2015, 10(3), 1431–1435.

  • García-Chavarría, M. and Lara-Flores, M., The use of carotenoid in aquaculture. Res. J. Fish. Hydrobiol., 2013, 8, 38–49.

  • Arvanitoyannis, I. S. and Kassaveti, A., Fish industry waste: treatments, environmental impacts, current and potential uses. Int. J. Food Sci. Technol., 2008, 43, 726–745.

  • Huggins, K. A., Navara, K. J., Mendonça, M. T. and Hill, G. E., Detrimental effects of carotenoid pigments: the dark side of bright coloration. Naturwissenschaften, 2010, 97, 637–644; doi:10.1007/ s00114-010-0679-6.

  • Fox, H. M. and Vevers, G., The Nature of Animal Colours, Macmillan, New York, USA, 1960.

  • Pattanaik, S. S., Sawant, P. B., Xavier, K. M., Dube, K., Srivastava, P. P., Dhanabalan, V. and Chadha, N. K., Characterization of carotenoprotein from different shrimp shell waste for possible use as supplementary nutritive feed ingredient in animal diets. Aquaculture, 2020, 515, 734594; https://doi.org/10.1016/j.aquaculture.2019.734594.

  • Barbosa, M., Morais, R. and Choubert, G., Effect of carotenoid source and dietary lipid content on blood astaxanthin concentration in rainbow trout (Oncorhynchus mykiss). Aquaculture, 1999, 176, 331–341.

  • Tetens, I. and Poulsen, M., Scientific opinion on the safety of astaxanthin-rich ingredients (astareal a1010 and astareal l10) as novel food ingredients. EFSA J., 2014, 12(7), 3757.

  • Chien, Y.-H., Pan, C.-H. and Hunter, B., The resistance to physical stresses by Penaeus monodon juveniles fed diets supplemented with astaxanthin. Aquaculture, 2003, 216, 177–191.

  • Chien, Y.-H. and Shiau, W.-C., The effects of dietary supplementation of algae and synthetic astaxanthin on body astaxanthin, survival, growth, and low dissolved oxygen stress resistance of kuruma prawn, Marsupenaeus japonicus Bate. J. Exp. Mar. Biol. Ecol., 2005, 318, 201–211.

  • Niu, J., Tian, L. X., Liu, Y. J., Yang, H. J., Ye, C. X., Gao, W. and Mai, K. S., Effect of dietary astaxanthin on growth, survival, and stress tolerance of postlarval shrimp, Litopenaeus vannamei. J. World Aquacul. Soc., 2009, 40, 795–802.

  • Winge, Ö., The location of eighteen genes in Lebistes reticulatus. J. Genet., 1927, 18, 1–43.

  • Crispo, E., Bentzen, P., Reznick, D. N., Kinnison, M. T. and Hendry, A. P., The relative influence of natural selection and geography on gene flow in guppies. Mol. Ecol., 2006, 15, 49–62.

  • Zajitschek, S. R. and Brooks, R. C., Distinguishing the effects of familiarity, relatedness, and color pattern rarity on attractiveness and measuring their effects on sexual selection in guppies (Poecilia reticulata). Am. Nat., 2008, 172, 843–854.

  • Tripathi, N., Hoffmann, M., Willing, E.-M., Lanz, C., Weigel, D. and Dreyer, C., Genetic linkage map of the guppy, Poecilia reticulata and quantitative trait loci analysis of male size and colour variation. Proc. R. Soc. London, Ser. B, 2009, 276, 2195–2208.

  • Khoo, G. et al., Genetic linkage maps of the guppy (Poecilia reticulata): assignment of rapid markers to multipoint linkage groups. Mar. Biotechnol., 2003, 5, 279–293.

  • Zhu, Z., He, L. and Chen, S., Novel gene transfer into the fertilized eggs of gold fish (Carassius auratus l. 1758). J. Appl. Ichthyol., 1985, 1, 31–34.

  • Gong, Z., Wan, H., Tay, T. L., Wang, H., Chen, M. and Yan, T., Development of transgenic fish for ornamental and bioreactor by strong expression of fluorescent proteins in the skeletal muscle. Biochem. Biophys. Res. Commun., 2003, 308(1), 58–63.

  • Wan, H., He, J., Ju, B., Yan, T., Lam, T. J. and Gong, Z., Generation of two-color transgenic zebrafish using the green and red

  • fluorescent protein reporter genes gfp and rfp. Mar. Biotechnol., 2002, 4, 146–154.

  • Gong, Z., Ju, B. and Wan, H., Green fluorescent protein (gfp) transgenic fish and their applications. Genetica, 2001, 111, 213–225.

  • Stewart Jr, C. N., Go with the glow: fluorescent proteins to light transgenic organisms. Trends Biotechnol., 2006, 24, 155–162.

  • Vu, N. T., Cho, Y. S., Lee, S. Y., Kim, D. S. and Nam, Y. K., A cyan fluorescent protein gene (cfp)–transgenic marine medaka Oryzias dancena with potential ornamental applications. Fish. Aquat. Sci., 2014, 17, 479–486.

  • Lee, O., Green, J. M. and Tyler, C. R., Transgenic fish systems and their application in ecotoxicology. Crit. Rev. Toxicol., 2015, 45, 124–141.

  • Maclean, N. and Laight, R. J., Transgenic fish: an evaluation of benefits and risks. Fish Fish., 2000, 1, 146–172.

  • Devlin, R. H., Sundström, L. F. and Muir, W. M., Interface of biotechnology and ecology for environmental risk assessments of transgenic fish. Trends Biotechnol., 2006, 24, 89–97.

  • Piferrer, F., Beaumont, A., Falguière, J.-C., Flajšhans, M., Haffray, P. and Colombo, L., Polyploid fish and shellfish: production, biology and applications to aquaculture for performance improvement and genetic containment. Aquaculture, 2009, 293, 125–156.

  • Ng, P. K. and Tan, H., Freshwater fishes of Southeast Asia: potential for the aquarium fish trade and conservation issues. Aquarium Sci. Conserv., 1997, 1, 79–90.

  • Eşanu, V. O., Gavriloaie, C., Oroian, I. G. and Burny, P., Few remarks regarding some unnatural aquarium fish breeds and improper fish maintenance. Aquacult. Aquarium, Conserv. Legis., 2015, 8, 236–243.

  • Eşanu, V. O., Gavriloaie, C., Oroian, I. G. and Burny, P., Some considerations concerning the artificially colored aquarium fish trade. Aquacult. Aquarium, Conserv. Legis., 2015, 8, 116– 121.

  • Al-Sabti, K., Chlorotriazine reactive azo red 120 textile dye induces micronuclei in fish. Ecotoxicol. Environ. Safety, 2000, 47, 149–155.

  • Ángeles Esteban, M., An overview of the immunological defenses in fish skin. ISRN Immunol., 2012, 1–29.

  • Devlin, R. H. and Donaldson, E. M., Containment of genetically altered fish with emphasis on salmonids. In Transgenic Fish (eds Hew, C. L. and Fletcher, G. L.), World Scientific, Singapore, 1992, pp. 229–265.

  • McGraw, K. J., Dietary mineral content influences the expression of melanin-based ornamental coloration. Behav. Ecol., 2006, 18, 137–142.

  • Lall, S. P., The minerals. In Fish Nutrition (Third Edition) (ed. Hardy, R.), Elsevier Academic Press, 2002, pp. 259–308.

  • Rema, P. and Gouveia, L., Effect of various sources of carotenoids on survival and growth of goldfish (Carassius auratus) larvae and juveniles. J. Anim. Vetern. Adv., 2005, 4(7), 654–658.

  • Wang, Y.-J., Chien, Y.-H. and Pan, C.-H., Effects of dietary supplementation of carotenoids on survival, growth, pigmentation, and antioxidant capacity of characins, Hyphessobrycon callistus. Aquaculture, 2006, 261, 641–648.

  • Baron, M., Davies, S., Alexander, L., Snellgrove, D. and Sloman, K., The effect of dietary pigments on the coloration and behaviour of flame-red dwarf gourami, Colisa lalia. Anim. Behav., 2008, 75, 1041–1051.

  • Pan, C. H. and Chien, Y. H., Effects of dietary supplementation of alga Haematococcus pluvialis (Flotow), synthetic astaxanthin and β ‐carotene on survival, growth, and pigment distribution of red devil, Cichlasoma citrinellum (Günther). Aquacul. Res., 2009, 40, 871–879.

  • Ho, A. L., Orlando Bertran, N. M. and Lin, J., Dietary esterified astaxanthin concentration effect on dermal coloration and chromatophore physiology in spinecheek anemonefish, Premnas biaculeatus. J. World Aquacult. Soc., 2013, 44, 76–85.

  • Ho, A. L., O’Shea, S. K. and Pomeroy, H. F., Dietary esterified astaxanthin effects on color, carotenoid concentrations, and compositions of clown anemonefish, Amphiprion ocellaris, skin. Aquacult. Int., 2013, 21, 361–374.

  • Diler, İ. and Dilek, K., Significance of pigmentation and use in aquaculture. Turk. J. Fish. Aquat. Sci., 2002, 2, 97–99.


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  • The Quintessence of Colour Enhancement in Ornamental Fishes:An Empirical Pathway Towards Rainbow Revolution

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Authors

Paramita Banerjee Sawant
ICAR-Central Institute of Fisheries Education Versova, Mumbai 400 061, India
Srijit Chakravarty
ICAR-Central Institute of Fisheries Education Versova, Mumbai 400 061, India
Subrata Dasgupta
ICAR-Central Institute of Fisheries Education Versova, Mumbai 400 061, India
Narinder Kumar Chadha
ICAR-Central Institute of Fisheries Education Versova, Mumbai 400 061, India
Bhawesh T. Sawant
Taraporevala Marine Biological Research Station (Dr Balasaheb Sawant Konkan Krishi Vidyapeeth), Mumbai 400 051, India

Abstract


One of the greatest challenges in the ornamental fish industry is to replicate accurate natural colour of fishes in captivity. Numerous attempts to preserve colour in captivity have been ineffective in reducing its fading, making it an important determinant in the selection of ornamental fish species for trade in terms of saturation, brightness and hue. Colour development of ornamental fishes has been widely studied, yielding curious insights about evolutionary genetics and having a discerning role, either as deceptive or attractive (aposematic) signals in mating as well as in camouflaging (Delphic) patterns during predator–prey interactions. This article discusses colour enhancement strategies with reference to nutritional interventions through carotenoid-rich feed ingredients, genetic manipulation or injection of colour in subcutaneous layers of the skin. An insight into the mechanism of pigmentation shows that motility and pigment dispersion of chromatophores are the two drivers by which fishes control integumentary colour variation. Research on colour development and its enhancement has witnessed novel techniques to support the ornamental fish industry. Therefore, this article also sheds light to answer questions on various issues pertaining to environmental and physiological effects on colouration. It attempts to provide insight on potential research areas, with caution on ethical and legal issues to ensure sustainability, so as to restrict risks of unwanted inheritance of colour patterns. It also highlights the problems of identity crisis among conspecifics thereby bringing a ‘rainbow revolution’ to the ornamental industry.

Keywords


Colour Enhancement, Chromatophore, Ornamental Fish, Rainbow Revolution.

References





DOI: https://doi.org/10.18520/cs%2Fv119%2Fi7%2F1093-1100