当代科学研究指出:动物的大量病症是由于某些营养素的缺乏而引起的。碘是动物生长发育不可缺少的元素。虹鳟等鱼类在碘不足时,像高等动物一样,会发生甲状腺肿;甲状腺素能进一步改善鲤鱼卵的活力和孵化率,促进仔鲤成活、生长和发育,在国内外已有报道。美国全国研究理事会建议给 Contemporary scientific research points out that a large number of animal diseases are caused by the lack of certain nutrients. Iodine is an indispensable element of animal growth and development. Rainbow trout and other fish in iodine deficiency, like the higher animals, will occur goiter; thyroid hormone can further improve the vitality of carp eggs and hatching rate and promote the survival, growth and development of Aberdeen carps have been reported at home and abroad. The National Research Council suggested