Cite this paper:
SHI Ce, LIU Ying, YI Mengmeng, ZHENG Jimeng, TIAN Huiqin, DU Yishuai, LI Xian, SUN Guoxiang. Comparison of time-restricted and ad libitum self-feeding on the growth, feeding behavior and daily digestive enzyme profiles of Atlantic salmon[J]. Journal of Oceanology and Limnology, 2017, 35(4): 729-736

Comparison of time-restricted and ad libitum self-feeding on the growth, feeding behavior and daily digestive enzyme profiles of Atlantic salmon

SHI Ce1,3, LIU Ying1,3,4, YI Mengmeng1,2, ZHENG Jimeng1,2, TIAN Huiqin1, DU Yishuai1,3, LI Xian1,3, SUN Guoxiang1,3
1 Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;
2 University of Chinese Academy of Sciences, Beijing 100049, China;
3 National & Local Joint Engineering Laboratory of Ecological Mariculture, Qingdao 266071, China;
4 Dalian Ocean University, School of Marine Science and Environment Engineering, Dalian 116023, China
Abstract:
Although it has been hypothesized that a predictable feeding regime in animals allows physiological variables to be adjusted to maximize nutrient utilization and, hence, better growth performance, the assumption has rarely been tested. This study compares the effects of time-restricted versus free access self-feeding on the growth, feeding behavior and daily digestive enzyme rhythms of Atlantic salmon (Salmo salar). In an experiment that lasted 6 weeks, fish (109.9 g) were divided into two groups:group 1 had free access to a self-feeder (FA); group 2 received three meals per day (2 h per meal) at dawn, midday and dusk via a time-restricted self-feeder (TR). At the end of the experiment, the fish were sampled every 3 h over a 24-h period. The results showed that the TR fish quickly synchronized their feeding behavior to the feeding window and their blood glucose showed a significant postprandial increase, while FA fish displayed no statistically significant rhythms (P>0.05). Pepsin activity of TR fish also showed a significant daily rhythm (P<0.05) with the acrophase at the second feed and a decrease over the next 12 h. Average daily trypsin, lipase and amylase levels of FA fish were significantly lower than those of TR fish (P<0.01); however, the growth performance of both groups was similar (P>0.05). In conclusion, the study failed to confirm a link between the entrainment of daily digestive enzyme profiles and growth performance, with the TR group showing comparatively poor blood glucose regulation.
Key words:    Atlantic salmon (Salmo salar)|self-feeding regime|feeding behavior|digestive physiology|daily rhythm   
Received: 2015-12-16   Revised: 2016-01-28
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Articles by SHI Ce
Articles by LIU Ying
Articles by YI Mengmeng
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Articles by DU Yishuai
Articles by LI Xian
Articles by SUN Guoxiang
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