闽南近海常见鲨鳐类肝油的甾醇组成与含量
Liver Sterol Composition and Content of Common Species of Sharks and Rays off Southern Fujian Coastal Waters
Abstract
闽南近海常见鲨鳐类肝油的甾醇组成都极其简单,胆甾醇是唯一的成分.大部分种类肝油的胆甾醇含量变化在0114%~0541%之间.尖头斜齿鲨肝油的胆甾醇含量与个体的发育状况有关.在雄性胚胎、幼鱼和成鱼三者中,胚胎期个体肝油的胆甾醇含量最高;幼鱼胆甾醇含量维持在较高的水平,成鱼最低.生殖季节,妊娠期雌鱼的肝油胆甾醇含量明显降低;妊娠结束后,肝油胆甾醇含量迅速回升. Sterol composition in the liver oils of common species of sharks and rays off southern Fujian coastal waters was extremely simple and cholesterol was the only component sterol present in all the livers analyzed The cholesterol content in the liver oils of these species ranged from 0 114%～0 541%.Cholesterol content in the liver oils of Scoliodon sorrakowah could change with the physiological stages of the animals Among embryo,juvenile and adult male fish,the liver cholesterol content of embryo was highest, and that of immature fish with poorly differentiated testicles maintained at a high level, while that of adult fish was relatively low During spawning season, cholesterol content of female S sorrakowak at gestation stage decreased apparently, then increased after ending gestation. The fluctuation of cholesterol content might be correspond to growth and reproductive activities of the animals.