Photic and circadian regulation of self-feeding activity in ayu |
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| Authors: | Masafumi Amano Masayuki Iigo Kiyoshi Furukawa Mitsuo Tabata Kunio Yamamori |
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| Affiliation: | School of Fisheries Sciences, Kitasato University, Ofunato, Iwate 022-0101,;Department of Applied Biochemistry, Faculty of Agriculture, Utsunomiya University, Utsunomiya, Tochigi 321-8505,;Department of Aquatic Bioscience, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo, Tokyo 113-8657, and;Department of Animal Sciences, Teikyo University of Science and Technology, Yamanashi 409-0100, Japan |
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| Abstract: | ABSTRACT: The self-feeding rhythms of ayu Plecoglossus altivelis altivelis were examined. Individual ayu (mean body weight 40 g) were held in 60-L glass tanks equipped with self-feeders. Six of 14 fish learned self-feeding during the experiment. Under two different light–dark (LD) conditions (16 h:8 h and 8 h:16 h LD), self-feeding was synchronized to the LD cycle, and feeding occurred almost exclusively during the light phase. During exposure to constant light (LL), circadian feeding rhythms were observed. These results indicate self-feeding rhythms in ayu are restricted to the light phase under LD conditions and are controlled by the circadian clock under LL conditions. |
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| Keywords: | ayu circadian rhythms daily rhythms self-feeding |
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