团头鲂血清甲状腺激素浓度的周年变化

运用双抗体放射免疫测定法研究团头鲂（Ｍｅｇａｌｏｂｒａｍａ ａｍｂｌｙｃｅｐｈａｌａ）血清中甲状腺素（Ｔ４）和三碘甲腺原氨酸（Ｔ３）浓度的周年变化。血清Ｔ４和Ｔ３在春季性腺迅速发育时期形成峰值，Ｔ４的升高比Ｔ３早一个月。繁殖期后。血清Ｔ４和Ｔ３水平降低，血清Ｔ４分别在８月和１０月出现两个小峰；Ｔ３在７月－１１月维持较稳定的水平。血清Ｔ４、Ｔ３在冬季的水平均较低。对血清甲状腺激素在春季升高的生理意义作了讨论。

Annual variations in serum thyroid hormone levels of Megalobrama amblycephala

Annual variations in serum thyroxine(T 4) and triiodo L thyronine(T 3) concentrations were measured by double antibody radioimmunoassay in the blunt snout bream(Megalobrama amblycephala). Serum T 4 and T 3 levels were elevated and up to peaks during the spring concomitant with the rapid development of gonads, the elevation of serum T 4 was in March early than the T 3, After the reproductive stage, serum levels of T 4 and T 3 declined, serum T 4 showed two small peaks in August and October respectively; Serum T 3 levels were constant throughout the Summer and Autumn (July to November). Serum T 4 and T 3 levels were low during the winter, the minimum levels of both T 4 and T 3 were in December. The physiological significance of thyroid hormone elevations during spring are discussed.