固醇类是环戊烷多氢菲的衍生物,其种类很多,在动植物体内与油脂并存,是油溶性的,但不能被皂化.固醇类中的胆固醇,对人和动物的营养生理影响较大,颇为人们所瞩目.据说,甲壳类动物缺乏合成胆固醇的能力.手岛新一用放射示踪技术证实日本对虾不能合成胆固醇,养殖对虾饵料中如缺乏胆固醇,对虾即生长迟缓.金泽昭夫进一步研究 Sterols are derivatives of cyclopentane polyhydropyran, many of which are oil soluble and coexist in plants and animals and are oil soluble but not saponified. Cholesterol in sterols is responsible for the nutritional physiology of humans and animals It is said that crustaceans lack the ability to synthesize cholesterol. Shimadao new radioactive tracer technology confirmed that Japanese shrimp can not synthesize cholesterol, such as the lack of cholesterol in cultured shrimp feed, shrimp growth retardation. Akira Kanazawa further study