《Table 2 Cosinor values for group and individual self-feeding activities》

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《Long-term monitoring of the individual self-feeding behavior of rainbow trout Oncorhynchus mykiss》

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The rainbow trout were diurnal feeders，but variability among the individuals was also evident（Fig.4）.The HT fi sh seemed to synchronize the feed demand acts of the low-triggering fi sh，thereby directing the group feeding activity pattern（Fig.4），which was also found in sea bass（Millot and Bégout，2009）.Cosinor analysis also showed that the acrophase of the two HT fi sh in the same tank（Tanks2 and 3）were quite close to each other（Table 2），indicating the possible existence of instrumental conditioning，i.e.the activation of the trigger by subordinate fi sh is probably based on a behavioral response as the observation of other fi sh feeding（Heydarnejad and Purser，2013）.In experimental period，spontaneous alternation of fi sh of the high trigger status was observed（Tanks 2 and 3）（Fig.5） .When a HT fi sh ceased triggering activity，the LT fi sh increased its demanding feeding behavior，as a result the group still showed normal feed intake.It seems that the high trigger function rather than the HT individual itself，is essential for the group to remain stable.Pervious study showed that in a group of 10rainbow trout，when the HT fi sh is removed artifi cially，subordinate rainbow trout stopped demand feeding（n=10）（Heydarnejad and Purser，2013） ，as well as the whole group.Nevertheless，in a larger group of sea bass（n=50）new HT fi sh would reappear after the former HT fi sh is removed（Di-Poi et al.，2008）.The reason for the alternation of high trigger status in this study is still unclear，however，these results partly indicate that i) the group size is important in determining the self-feeding plasticity of the group，and ii) artifi cial interference is a stronger infl uencing factor than internal variation of fi sh population.The physiological characteristic of the fi sh in diff erent feeding category，which is important in understand the structure of fi sh population surrounding the selffeeding system，needs to be further studied.