Effects of photoperiod on daily activity rhythm of juvenile sea cucumber, Apostichopus japonicus (Selenka)
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Effects of photoperiod on daily activity rhythm of juvenile sea cucumber, Apostichopus japonicus (Selenka)
Effects of photoperiod on daily activity rhythm of juvenile sea cucumber, Apostichopus japonicus (Selenka)
海洋湖沼学报(英文)2011年29卷第5期 页码:1015-1022
Affiliations:
1. The Key Laboratory of Mariculture Ministry of Education Ocean University of China
2. Freshwater Fishery Research Institute of Shandong Province
Author bio:
Funds:
Supported by the National Natural Science Foundation of China (Nos. 30871931, 30771661) and the National Key Technology Research and Development Program of China (Nos. 2006BAD09A01), and the National Special Research Fund for Non-Profit Sector (No. 200905020)
Effects of photoperiod on daily activity rhythm of juvenile sea cucumber, Apostichopus japonicus (Selenka)[J]. 海洋湖沼学报(英文), 2011,29(5):1015-1022.
Dong, G., Dong, S., Tian, X. et al. Effects of photoperiod on daily activity rhythm of juvenile sea cucumber, Apostichopus japonicus (Selenka)., Chin. J. Ocean. Limnol. 29, 1015–1022 (2011). https://doi.org/10.1007/s00343-011-0204-6
Effects of photoperiod on daily activity rhythm of juvenile sea cucumber, Apostichopus japonicus (Selenka)[J]. 海洋湖沼学报(英文), 2011,29(5):1015-1022. DOI: 10.1007/s00343-011-0204-6.
Dong, G., Dong, S., Tian, X. et al. Effects of photoperiod on daily activity rhythm of juvenile sea cucumber, Apostichopus japonicus (Selenka)., Chin. J. Ocean. Limnol. 29, 1015–1022 (2011). https://doi.org/10.1007/s00343-011-0204-6DOI:
Effects of photoperiod on daily activity rhythm of juvenile sea cucumber, Apostichopus japonicus (Selenka)
摘要
Abstract
In nature
Apostichopus japonicus exhibits a behavioral characteristic of emerging at night and sheltering during the day. Hence
it was commonly believed that longer and darker light conditions are better for a population of A. japonicus. In aquaculture situations therefore
animals have commonly been cultured without lighting
especially during juvenile-hatching culture. However
how the length of darkness each day affects A. japonicus and what the mechanism is of behavioral response of A. japonicus to different photoperiods remain unclear
and are specifically addressed in this study. We applied nine photoperiod treatments (light:dark (LD) cycles at 0:24
3:21
6:18
9:15
12:12
15:9
18:6
21:3
and 24:0 under 500 lx) to 60 individuals (29.73 ± 0.23 g) per treatment (with 3 replicates). The environmental conditions were set as: water temperature = 16.9 ± 0.3°C
dissolved oxygen>6.0 mg/L
ammonia<0.3 mg/L
pH = 7.8–8.2
and salinity = 30–32. Under experimental conditions of continuous darkness as well as continuous light
cyclic nocturnal activity patterns of A. japonicus (viz. the animals emerged and fed at night and sheltered during the day) were observed. However
they spent more and less time
respectively
moving and feeding under continuous darkness and continuous light
than those under a natural light cycle. Under photoperiods with 6–12 h of light
the animals showed one sheltering behavior transition and two emerging behavior transitions. These behavior transitions appeared to be governed by some internal physiological factors and induced by daily light variation. The behavior of the animals was significantly affected by different photoperiods
and the distribution rate (DR) of the animals emerging at “daytime” increased with lengthening “light time” (except for the LD 3:21 cycle). We also found that there was no significant difference in mean DR per day under LD cycles of 6:18
9:15
15:9
and 12:12. Mean DRs per day were significantly lower for these photoperiods
than for those under LD cycles of 0:24 and 3:21
and significantly higher than for those under LD cycles of 18:6
21:3 and 24:0. These results imply that 6–15 h light per day were the similar photoperiods to natural sunlight. From the viewpoint of activity and feeding behaviors
these might be the optimal photoperiods for rearing A. japonicus.
关键词
Keywords
references
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