Food- and light-entrainable oscillators control feeding and locomotor activity rhythms, respectively, in the Japanese catfish, Plotosus japonicus |
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Authors: | Masanori Kasai Sadao Kiyohara |
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Institution: | (1) Chemistry and BioScience of Science Course, Graduate School of Science and Engineering, Kagoshima University, Kagoshima 890-0065, Japan |
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Abstract: | Feeding and locomotor activities of the Japanese catfish Plotosus japonicus under solitary condition were recorded to identify mechanisms controlling these behaviours. In the absence of food, the catfish
showed nocturnal locomotor activity, but no feeding activity. Under ad libitum food conditions, both feeding and locomotor
activities occurred during the dark period and were synchronized with light/dark (LD) cycles. Feeding activity lasted for
11–24 days when food was stopped after ad libitum food availability. Restricted food during the light phase produced both
food-anticipatory and light-entrainable feeding activity. Furthermore, this condition produced weak food-anticipatory and
light-entrainable locomotor activity. Under the light/light (LL) condition, restricted food produced food-anticipatory feeding
and locomotor activities, suggesting that a food-entrainable oscillator controls both feeding and locomotor activities. However,
under the LL condition, light-entrainable feeding and locomotor activities were not observed, suggesting that a light-entrainable
oscillator controls both feeding and locomotor activities. During a restricted food schedule, LD cycle shifts resulted in
disrupted synchronization of feeding activity onset in three of the four fish, but one fish showed synchronized feeding activity.
These results suggest that the food- and the light-entrainable oscillator may control feeding and locomotor activities, respectively. |
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