Iigo M, Aida K
Department of Anatomy, St. Marianna University School of Medicine, Kawasaki, Japan.
J Pineal Res. 1995 Mar;18(2):62-8. doi: 10.1111/j.1600-079x.1995.tb00141.x.
Effects of season, environmental temperature, and photoperiod on plasma melatonin concentrations were studied in the goldfish, Carassius auratus. When goldfish were reared under natural conditions, melatonin levels at mid-dark exhibited seasonal changes, with higher levels obtained in June and September than in December and March. When fish were kept under light:dark (LD) cycle of 12:12 at 5, 15, or 25 degrees C during March-April, temperature-dependent increases in melatonin levels at mid-dark were observed. When animals were maintained under LD 16:8 or LD 8:16 in combination with temperature changes (5, 15, and 25 degrees C) during January-February, the duration of nocturnal elevation in melatonin was controlled by the length of the scotophase while the amplitude was influenced by environmental temperature. These results indicate that plasma melatonin profiles in the goldfish exhibit seasonal changes that are regulated by both photoperiod and temperature.
研究了季节、环境温度和光周期对金鱼（Carassius auratus）血浆褪黑素浓度的影响。当金鱼在自然条件下饲养时，黑暗期中期的褪黑素水平呈现季节性变化，6月和9月的水平高于12月和3月。在3月至4月期间，当鱼在5℃、15℃或25℃的12:12光暗（LD）周期下饲养时，观察到黑暗期中期褪黑素水平随温度升高。在1月至2月期间，当动物在LD 16:8或LD 8:16与温度变化（5℃、15℃和25℃）组合条件下饲养时，褪黑素夜间升高的持续时间受暗期长度控制，而幅度受环境温度影响。这些结果表明，金鱼血浆褪黑素水平呈现季节性变化，且受光周期和温度共同调节。
