|Appears in Collections:||Aquaculture Journal Articles|
|Peer Review Status:||Refereed|
|Title:||Circadian Rhythms of Locomotor Activity in the Nile Tilapia Oreochromis niloticus|
Sanchez-Vazquez, F Javier
|Citation:||Vera L, Cairns L, Sanchez-Vazquez FJ & Migaud H (2009) Circadian Rhythms of Locomotor Activity in the Nile Tilapia Oreochromis niloticus, Chronobiology International, 26 (4), pp. 666-681.|
|Abstract:||Behavioral rhythms of the Nile tilapia were investigated to better characterize its circadian system. To do so, the locomotor activity patterns of both male and female tilapia reared under a 12:12 h light-dark (LD) cycle were studied, as well as in males the existence of endogenous rhythmicity under free-running conditions (DD and 45 min LD pulses). When exposed to an LD cycle, the daily pattern of activity differed between individuals: some fish were diurnal, some nocturnal, and a few displayed an arrhythmic pattern. This variability would be typical of the plastic circadian system of fish. Moreover, reproductive events clearly affected the behavioral rhythms of female tilapia, a mouth-brooder teleost species. Under DD, 50% (6 of 12) of male fish showed circadian rhythms with an average period (t) of 24.1+0.2 h, whereas under the 45 min LD pulses, 58% (7 of 12) of the fish exhibited free-running activity rhythms with an average t of 23.9+0.5 h. However, interestingly in this case, activity was always confined to the dark phase. Furthermore, when the LD cycle was reversed, a third of the fish showed gradual desynchronization to the new phase, taking 7–10 days to be completely re-entrained. Taken together, these results suggest the existence of an endogenous circadian oscillator that controls the expression of locomotor activity rhythms in the Nile tilapia, although its anatomical localization remains unknown.|
|Rights:||Published in Chronobiology International. Copyright: Taylor & Francis (Informa Healthcare). This is an electronic version of an article published in Chronobiology International, Volume 26, Issue 4, May 2009, pp. 666 - 681. Chronobiology International is available online at: http://www.informaworld.com/openurl?genre=article&issn=0742-0528&volume=26&issue=4&spage=666|
|STORRE Veral et al., Tilapia locomotor activity .pdf||400.49 kB||Adobe PDF||View/Open|
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