Abstract
The pattern of adrenergic innervation to scale chromatophores of the wild-type medaka, Oryzias latipes, was examined by autoradiography with 3H-norepinephrine and found for the first time to be changed reversibly during prolonged background adaptation. In scales of the medaka, which was adapted to a black background for 10-15 days, a great number of melanophores and dense networks of varicose fibers were observed: many fibers built up a radial plexus around each melanophore. However, the dense distribution of varicose fibers disappeared with a decrease in the number of melanophores during long-term adaptation to a white background. As to the changes in the innervation pattern to amelanotic melanophores of the medaka, orange-red variety, a similar result was obtained. Although the increase in the number of leucophores was observed in the medaka adapted to a white background, no exact plexuses of labeled fibers were confirmed around leucophores. From these results, it is concluded that the density of chromatic nerve fibers changes in parallel with the variation of the number of melanophores during prolonged background adaptation.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.