闽南近海条纹斑竹鲨(Chiloscyllium plagiosum)肝脏含脂率的变化与性成熟的关系

以闽南近海条纹斑竹鲨为研究对象,研究肝体指数和肝脏含油率的周年变化及其与年龄的关系,结果表明条纹斑竹鲨的肝体指数(LSI)的变化主要是由肝脏含油率的波动引起的,而肝脏含油率的变化与生殖活动有关;1龄鱼个体LSI和肝脏含油率变化不大,而2龄鱼以后的个体之间差异显着,我们推断,有些2龄鱼的肝脏开始储存大量脂肪为初次性成熟储存能量,条纹斑竹鲨的初次性成熟年龄应为3龄.而且成熟个体的肝体指数与肝脏含油率都存在明显的季节变化,3月至6月存在一个高峰;而未成熟个体的季节变化不明显.推测条纹斑竹鲨的生殖季节在3月至6月之间.

The Relation Between the Percentage of Total Liver Oil and Gender Mature in White-spotted Bamboo Shark ( Chiloscyllium plagiosum )off South Fujian Coastal Waters

In this paper,Liver-somatic index(LSI) and the percentage of total liver oil in white-spotted bamboo shark(C.plagiosum)in south Fujian were analysed to find the relation.Variation in LSI and the percentage of total lipid of livers with season and age were studied.LSI changes with the percentage of total lipid of livers,which might be related to reproductive activities of the animals.The age of first sexual maturing was a very important turning point in the life history of animal.Significant difference among LSI,the content of liver oil and age was found.In specimens of 1 year old,LSI and the content of liver oil were stable,but in 2 years old,there were significant differences both LSI and the content of liver oil.So,the percentage of total oil in liver of some 2 year old fishes increased rapidly to deposit energy for procreation,and the age of first sexual maturing was age 3.Significant seasonal variation in LSI and the percentage of total liver oil also was found in both mature males and females.There was a peak from March to June.But no significant difference in the LSI and the content of liver oil of immature specimens.These results suggested that LSI and the percentage of total oil of C.plagiosum liver were influenced by season.The reproductive season of white-spotted bamboo shark(C.plagiosum)was from March to June.