Effects of light on plasma somatolactin levels in red drum (Sciaenops ocellatus)

General and Comparative Endocrinology
Y Zhu, P Thomas

Abstract

The effects of illumination on circulating somatolactin (SL) levels were studied in red drum sampled at various times during a 24-h light-dark cycle (l2L:l2D) and during a 24-h period of constant light. Plasma SL concentrations were low in red drum sampled during the light phase (0.6 +/- 0.05-1.1 +/- 0.2 ng/ml). The levels were significantly elevated during the early-dark phase (5.8 +/- 1.0 ng/ml) and declined during the late-dark phase (0.39 +/- 0.05 ng/ml). In contrast, plasma SL levels remained low. (0.4 +/- 0.1-1.3 +/- 0.4 ng/ml) in fish sampled through a 24-h constant light period following a 1-week exposure to the light-dark cycle. Circulating SL levels were also significantly elevated during the early-dark phase in fish maintained under a reversed light-dark cycle. The role of the eyes in mediation the SL response to light was evaluated by comparing circulating SL levels in optic-tract sectioned and enucleated fish with those of intact (control) fish. Plasma SL concentrations were significantly higher in optic-tract sectioned and enucleated fish (6.5 +/- 0.9-13.8 +/- 1.5 ng/ml) than in control fish (0.6 +/- 0.05-3.9 +/- 0.7 ng/ml) during both the early-dark phase and the early-light phase of the 24-h light-dark cycle. Th...Continue Reading

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Citations

Jul 18, 2009·Comparative Biochemistry and Physiology. Part B, Biochemistry & Molecular Biology·L Vargas-ChacoffG Martínez-Rodríguez
Mar 3, 2009·Comparative Biochemistry and Physiology. Part B, Biochemistry & Molecular Biology·L Vargas-ChacoffG Martínez-Rodríguez
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Dec 17, 2005·General and Comparative Endocrinology·Hiroshi Kawauchi, Stacia A Sower
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Nov 22, 2020·General and Comparative Endocrinology·Paula G VissioTomás H Delgadin
May 27, 2003·General and Comparative Endocrinology·M Javier Herrero-TurriónJuan M Lara

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