Effect of Thyroxine Plus Thiourea on the Early Development of the Chum Salmon (Oncorhynchus keta)
Effect of Thyroxine Plus Thiourea on the Early Development of the Chum Salmon (Oncorhynchus keta)
复制标题
甲状腺素加硫脲对鲑鱼 (Oncorhynchus keta) 早期发育的影响
作者：
M. A. Ali
现有证据表明，甲状腺激素对鱼类的影响是形态发生作用，而不是代谢作用。甲状腺治疗在发育过程中以不同的方式刺激生长，因此鳍、体壁、体重和长度的比例都会改变。鲑鱼皮肤中鸟嘌呤的沉积2和鲟鱼(鲟鱼属)鳞片的形成速度加快。在对鲑鱼的研究中，Dales和Hoar4发现硫脲减缓了生长和形态形成过程。他们发现，虽然在用甲状腺素处理的艾维因的情况下，体壁很早就开始在卵黄囊上生长，但在用硫脲处理的情况下，这一过程相当缓慢。本试验是为了确定甲状腺素和硫脲的混合物对鲑鱼早期发育的影响而进行的。有趣的是，在混合物中，甲状腺素的作用是否会优于硫脲，或者反之亦然。
AVAILABLE evidence indicates that the effect of the thyroid hormone in fishes is morphogenetic rather than metabolic. Thyroid treatment stimulates growth differentially during development, so that proportions of fins, body-wall, weight and length are altered. Deposition of guanine in the skin of the salmonids2 and the rate of formation of scales in sturgeons (genus Acipenser) are accelerated3. Working with the chum salmon, Dales and Hoar4 found that thiourea slowed down growth and morphogenetic processes. They found that, while the body-wall started growing over the yolk sac very early in the case of alevins treated with thyroxine, this process was considerably retarded in the forms treated with thiourea. The experiment, the results of which are presented here, was undertaken in order to ascertain the effect of a mixture of thyroxine and thiourea on the early development of the chum salmon. It was of interest to find out whether, in a mixture, the effect of thyroxine would be dominant over that of thiourea or vice versa.