| Chromatophores and color revelation in the blue variant of the Siamese fighting fish (Betta splendens). | |
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MedLine Citation:
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PMID: 21803590 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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Our light and electron microscopy observations have revealed that the chromatic unit for the caudal fin in the blue variant of the Siamese fighting fish consists exclusively of dermal chromatophores comprised of compact and overlapping light-reflecting motile iridophores underlined by a layer of light absorbing melanophores. The 2 subtypes that make up about 70% of the skin tissue are located just below the basal layer of the considerably thin epidermis. The administration of K-rich saline or norepinephrine induced prompt, but gradual and reversible, changes in the color of the skin from blue to a brown-yellowish color. The induced color change is attributable either to the neurotransmitter releasing effects of the K-rich saline or to the direct effects of norepinephrine on the postsynaptic alpha adrenergic receptors. Both of these agents induced aggregation of the melanosomes within the melanophores and apparently shifted the wavelength of the light reflected by the iridophores towards the shorter (blue) end of the spectrum. Based on the distribution and architectural arrangement of the iridophores and melanophores as well as their physiological responses, we conclude that the generation of the blue coloration in this fish predominantly occurs through motile iridophores via a multilayered thin-film interference phenomenon of the non-ideal type. The presence of the underlying melanophores provides a black sheet of melanin that enhances the chroma and purity of the color. |
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Authors:
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M H Amiri; Huda M Shaheen |
Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-7-12 |
Journal Detail:
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Title: Micron (Oxford, England : 1993) Volume: - ISSN: 1878-4291 ISO Abbreviation: - Publication Date: 2011 Jul |
Date Detail:
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Created Date: 2011-8-1 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9312850 Medline TA: Micron Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Copyright Information:
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Copyright © 2011 Elsevier Ltd. All rights reserved. |
Affiliation:
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Department of Biology, Faculty of Science, UAE University, United Arab Emirates. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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