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Appears in Collections:Aquaculture Journal Articles
Peer Review Status: Refereed
Title: Daily locomotor activity and melatonin rhythms in Senegal sole (Solea senegalensis)
Author(s): Bayarri, Maria Jose
Munoz-Cueto, Jose Antonio
Lopez-Olmeda, Jose F
Vera, LM
Rol De Lama, Maria Angeles
Madrid, Juan Antonio
Sanchez-Vazquez, F Javier
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Keywords: melatonin
locomotor activity rhythms
daily rhythms
Solea senegalensis
light pulse
Issue Date: Jun-2004
Date Deposited: 27-Mar-2014
Citation: Bayarri MJ, Munoz-Cueto JA, Lopez-Olmeda JF, Vera L, Rol De Lama MA, Madrid JA & Sanchez-Vazquez FJ (2004) Daily locomotor activity and melatonin rhythms in Senegal sole (Solea senegalensis). Physiology and Behavior, 81 (4), pp. 577-583.
Abstract: The daily locomotor and melatonin rhythms of the Senegal sole, a benthonic species of increasing interest in aquaculture, are still unknown, despite the fact that such knowledge is of prime importance for optimising its production. The aim of the present research was therefore to investigate the daily rhythms of locomotor activity and melatonin in the Senegal sole. For this purpose, the individual locomotor activity rhythms of fish were registered using a photocell. Plasma and ocular melatonin rhythms were studied in animals reared in circular tanks placed in earth under an LD 12:12 light regime and 16-18 °C temperature range (spring equinox). Blood and eye samples were taken every 3 h during a complete 24-h cycle. The impact of a light pulse in the middle of the dark period (MD) on plasma melatonin was also studied. Locomotor activity was mainly nocturnal, with 84.3% of the total activity occurring during darkness. The levels of plasma melatonin were higher at night (55 pg/ml) than during the day (2 pg/ml), while ocular melatonin levels appeared to be arrhythmic. Both weight and melatonin content were found to be significantly higher in the left eye in relation to the right eye. A light pulse in MD provoked a significant decrease in plasma melatonin levels. In summary, photoperiod is a key factor in synchronising locomotor activity and melatonin rhythms in the Senegal sole, whose nocturnal habits should be taken into account for their rearing by aquaculture.
DOI Link: 10.1016/j.physbeh.2004.02.001
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