Iridophores Involved in Generation of Skin Color in the Zebrafish, Brachydanio rerio
نویسندگان
چکیده
We examined the distribution of iridophores in the skin of the zebrafish and the effects of a neurotransmitter and hormones on the cells. In the skin of deep blue stripe areas, motile iridophores are distributed over the layer of melanophores, while in the dorsal skin, such cells underlie melanophores and xanthophores. These iridophores assume blue coloration in physiological saline probably through multilayered thin-film interference phenomenon of non-ideal type, and norepinephrine (NE) induces color change to yellow within 1–2 min. The action of NE is mediated through α-adrenoceptors on the iridophore membrane. MCH (melanin concentrating hormone) and MSH (melanophore stimulating hormone) have no effect on the cells. Iridophores manifesting whitish color exist densely in the skin of white stripe regions, and these iridophores are immotile. Immotile iridophores of another type are compactly arranged beneath the melanophore layer in the skin corresponding to deep blue stripes. The role of the iridophores in the generation of skin color and its changes is discussed.
منابع مشابه
Zebrafish Behavior References
A. 1981. Attraction of zebrafish, Brachydanio rerio to isolated and partially purified chromatographic fractions. Enivron. Baier, H. 2000. Zebrafish on the move: towards a behavior-genetic analysis of vertebrate vision. behavioral screening method for detecting auditory response defects in zebrafish. An increase in habitat complexity reduces aggression and monopolization of food by zebra fish (...
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