Circadian self-feeding rhythms in greater amberjack Seriola dumerili (Risso) 
Author(s): Chen, WM (Chen, W. -M.); Umeda, N (Umeda, N.); Mitsuboshi, T (Mitsuboshi, T.); Hirazawa, N (Hirazawa, N.) 
Source: JOURNAL OF FISH BIOLOGY  Volume: 70   Issue: 2   Pages: 451-461   DOI: 10.1111/j.1095-8649.2007.01316.x   Published: FEB 2007 


הנה התקציר:Abstract: In the present study, 10 greater amberjack Seriola dumerili held individually were given free access to self-feeder, and trigger actuations were continuously monitored. Most (80%) of greater amberjack developed stable self-feeding activity within 1 week. The fish was a rigidly diurnal feeder under a 12L:12D cycle, with a feeding peak of 1-3 h occurring just after the onset of lights. Under constant conditions, all 10 individual fish exhibited free-running self-feeding rhythms, which persisted for 43 days without a sign of damping out. As far as is known, this seems to be the longest record of free-running behavioural rhythms in fishes. Except one fish free-ran at a period length (tau) of 25.2 h, tau of free-running self-feeding rhythms in the other nine fish was shorter than 24 h, ranging from 20.0 h to 21.5 h. In addition, phase transients of feeding activity were observed in response to the advancement of lights on. It is concluded that feeding activity in greater amberjack is mediated by endogenous circadian oscillators.

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