Please use this identifier to cite or link to this item: http://hdl.handle.net/1893/19639
Appears in Collections:Aquaculture Journal Articles
Peer Review Status: Refereed
Title: Locomotor, feeding and melatonin daily rhythms in sharpsnout seabream (Diplodus puntazzo)
Authors: Vera, LM
Madrid, Juan Antonio
Sanchez-Vazquez, F Javier
Contact Email: luisa.veraandujar@stir.ac.uk
Keywords: sharpsnout seabream
locomotor activity
feeding behavior
melatonin
Issue Date: 15-Jun-2006
Publisher: Elsevier
Citation: Vera L, Madrid JA & Sanchez-Vazquez FJ (2006) Locomotor, feeding and melatonin daily rhythms in sharpsnout seabream (Diplodus puntazzo), Physiology and Behavior, 88 (1-2), pp. 167-172.
Abstract: Sharpsnout seabream is a marine teleost of increasing interest for Mediterranean aquaculture, but there is still a lack of information regarding its circadian organization. In this study, we have investigated sharpsnout seabream locomotor activity, feeding and plasma melatonin daily rhythms under a 12:12-h LD cycle, as well as the persistence of locomotor activity circadian rhythmicity under constant light (LL) conditions. When submitted to an LD cycle, most sharpsnout seabream displayed a diurnal locomotor pattern, with an average 74% of activity recorded during daytime. However, along the experiment 40% of fish spontaneously changed their locomotor rhythm phasing and became nocturnal. Feeding behaviour, nevertheless, remained strictly diurnal in all cases, with 97% of food demands being made during the light period. Free-running locomotor rhythms were recorded in one third of the fish kept under LL. Daily plasma melatonin levels displayed a rhythmic profile, with low daytime values (111 pg/ml) and high nighttime concentrations (791 pg/ml). Taken together, these results evidence a high degree of plasticity for sharpsnout seabream activity patterns, as well as phasing independence of locomotor and feeding rhythms. Finally, the existence of a well-defined daily rhythm of plasma melatonin was found.
Type: Journal Article
URI: http://hdl.handle.net/1893/19639
DOI Link: http://dx.doi.org/10.1016/j.physbeh.2006.03.031
Rights: The publisher does not allow this work to be made publicly available in this Repository. Please use the Request a Copy feature at the foot of the Repository record to request a copy directly from the author. You can only request a copy if you wish to use this work for your own research or private study.
Affiliation: Aquaculture
University of Murcia
University of Murcia

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