Seasonal change in the locomotor activity rhythm of the medaka, Oryzias latipes
Identifieur interne : 001548 ( Main/Exploration ); précédent : 001547; suivant : 001549Seasonal change in the locomotor activity rhythm of the medaka, Oryzias latipes
Auteurs : T. Yokota [Japon] ; T. Oishi [Japon]Source :
- International Journal of Biometeorology [ 0020-7128 ] ; 1992-03-01.
English descriptors
Abstract
Abstract: A group of the medaka,Oryzias latipes (Cyprinodontidae, orange-red variety, 25 males and 25 females), was kept in an aquarium, which was placed outdoors under natural conditions from December 1984 to January 1986. Locomotor activity at three layers (upper, middle, and lower layers) was recorded with a phototransistor system in each season. In summer, the fish showed typical diurnal activity at all three layers and the activity was greater than in other seasons. However, in autumn and winter, the fish became less active and showed relatively high activity at night at the upper or middle layer and diurnal activity at the lower layer. Nocturnal activity seemed to appear when the water temperature was decreased and the photoperiod was shortened. A free-running activity rhythm was also recorded under continuous darkness (DD) in each season; however, the fish showed clear free-running activity rhythms under DD only in summer.
Url:
DOI: 10.1007/BF01208733
Affiliations:
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