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Issue:ISSN 1000-7083
          CN 51-1193/Q
Director:Sichuan Association for Science and Technology
Sponsored by:Sichuan Society of Zoologists; Chengdu Giant Panda Breeding Research Foundation; Sichuan Association of Wildlife Conservation; Sichuan University
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Your Position :Home->Past Journals Catalog->2008 Vol.27 No.5

Diel Feeding Rhythm of Larval Silurus asotus in Different Photoperiods
Author of the article:QIAO Zhi-gang, ZHANG Ying-ying, ZHANG Guo-liang, PENG Xin-liang
Author's Workplace:(College of Life Sciences, Henan Normal University, Xinxiang, Henan Province 453007, China)
Key Words:Silurus asotus; larval fish; photoperiod; diel feeding rhythm
Abstract:The different photoperiods on the diel feeding rhythm of larval Silurus asotus at 23±1℃ were investigated. The fish were divided into 3 experimental groups: natural day-night group, continuous light group and continuous dark group. The results indicated that under the three photoperiods, they had continuous feeding characteristics in day and night, and revealed apparent feeding peak and feeding bottom at night and daytime respectively, and suggested that the larval Silurus asotus had obvious diel feeding rhythm. Moreover, the feeding rhythm of continuous light group was identical with that of the natural day-night group. However, the continuous dark group was different with the natural day-night group. The results showed that the feeding rhythm of larval Silurus asotus in natural day-night group and continuous light group were identical with that of the night feeding. However, the continuous dark group were not. The change of photoperiod had significant effect on the the daily feeding ratio in natural day-night group (P0.05).
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