绢丝丽蚌年龄与生长的研究  

STUDIES ON THE GROWTH OF LAMPROTULA FIBROSA

作　　者：龚世园[1] 刘军[1] 张训蒲[1] 何绪刚[1] 刘传凤[1] 

机构地区：[1]华中农业大学水产学院,武汉430070

出　　处：《水生生物学报》2003年第5期521-526,共6页Acta Hydrobiologica Sinica

基　　金：湖北省"九五"重点攻关项目资助 (编号 :95 1B110 7;991P12 0 1)

摘　　要：绢丝丽蚌一年生长一个生长轮。年轮可肉眼观察贝壳外表面凹陷的生长轮来鉴定 ,用纵剖贝壳明暗相间层数与打磨后观察棱柱层和珍珠层上的生长轮来验证。绢丝丽蚌 10龄以前生长较快 ,10龄以后生长逐渐减慢。 10龄以前年龄 (A)与壳长 (L)呈直线相关 ,年龄与壳重 (Ws)、体重 (W)均呈幂函数相关 ,其 10龄以前的方程式分别为 :L =0 8980A +0 86 0 0 (r=0 9883) ,Ws=1 0 175A2 3 3 99(r =0 9997) ,W =1 3188A2 3 3 3 3 r =0 9997)。 10龄以后年龄与壳长、壳重和体重均呈直线相关 ,其回归方程式分别为 :L =0 1817A +7 90 85 (r =0 9813) ,Ws=10 772 0A +6 1 1930 (r=0 990 2 ) ,W =13 6 96 0A +78 86 90 (r=0 990 3)。壳长与壳重、体重之间均呈幂函数相关 ,其相关方程式分别为 :Ws=0 6 30 3L2 4846(r=0 9999) ,W =0 8181L2 4775(r=0 9999)。壳重与体重之间呈线性相关 ,其回归方程式为 :W =0 35 6 0 +1 2 74 4Ws(r=0 9999)。Juvenile and adult mussels of Lamprotula fibrosa which were reared from 1995 to October, 200l. The mussels were from collected from on-growing fish ponds of Aquatic Experimental Station in the Fisheries College, Huazhong Agricultural University and the ponds which are connected to Wanghu Lake, Yangxin,Hubei. 2085 mussels were collected by harrow. For identifying the age exactly, L. fibrosa were cultured for three years in those ponds where they were collected to validate that the mussels grow to one or two growth rings once a year. Before experiment, shell length was measured, gaps were sawed by saw blade and the last growth ring was marked. The steps were repeated for three years. The amounts of growth ring were gained according as the thickness and the convolve or protruding of the annular line in the shell exterior and they were observed by naked eyes and noted. The ages were confirmed by new growth rings in the shell exterior of L. fibrosa reared in the ponds for one year. From the vertical side of the shells, the shells of L. fibrosa were composed by shell layers of bright and dark. The bright layer and the dark layer consisted with the annular lines which have a group of hollow and protuberant in the shell exterior respectively. It is the annual rings. Observing the growth rings in the shell exterior through naked eyes, the annual lines in shell exterior which are thick and hollow are the growth rings or annual rings. Those thin and protuberant lines are annual growth lines and not growth rings or annual rings. This can be validated by the amounts of the layers which have bright and dark lines in the vertical side of the shell. The ages of L. fibrosa can be identified effectively through the growth rings of the colony layer and the pearl layer after the keratode layer or colony layer were wore away by grinding wheel. L. fibrosa increased one growth ring once a year. The structure analyze shows that L. fibrosa in Wanghu Lake were 29 age groups. The proportion of 7—10 ages is 33.48% and that of 1—15 age

关 键 词：年龄 生长 绢丝丽蚌 软体动物门 瓣鳃纲 

分 类 号：Q959.215[生物学—动物学]