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Circadian self‐feeding rhythms in greater amberjack Seriola dumerili (Risso)
Author(s) -
Chen W.M.,
Umeda N.,
Mitsuboshi T.,
Hirazawa N.
Publication year - 2007
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1111/j.1095-8649.2007.01316.x
Subject(s) - biology , circadian rhythm , fish <actinopterygii> , fishery , zoology , rhythm , endocrinology , medicine
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 (τ) of 25·2 h, τ 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.