鄱阳湖红鳍原鲌(Cultrichthys erythropterus Basilewsky)的生长式型

Growth Pattern of Redfin Culter,Cultrichthys erythropterus Basilewsky(1855),in Poyang Lake

对2005-2006年采集于鄱阳湖的121尾红鳍原鲐（体长范围94．88-275．67mm）的年龄与生长进行了研究。鄱阳湖红鳍原鲐样本，年龄范围0^＋～6，以2-3龄为主，优势体长在120-200mm，占总个体数的75．21％，体重分布集中在30～150g，占76．03％。结果表明：体长与鳞长呈直线相关：L=58．7888＋20．4675＊SL，体长和体重呈幂函数关系：W=3．1×10^-6L^3.2975,属匀速生长，用vonBertalanffy方程描述其生长式型：L1=327．3487＊[1-e^-0.2112＊（1＋1.0745）]，W1=608．9887＊[1-e^-0.2112＊（1＋1.0745）]^3.2975。生长拐点年龄为4．57龄，对应体长为228．08mm，体重为184．98g。了解鄱阳湖红鳍原鲐的生长规律，为鄱阳湖红鳍原鲴资源的合理配置与利用提供依据。

Cultrichthys erythropterus Basilewsky （ 1855 ） is a primary species of freshwater fishes in Cultrinae, Cyprinidae. A total of 121 specimens （94.88 -275.67mm in standard length） were collected from Lake Poyang （28° 22′-29°45′N, 115°47′- 116°45′E）,the largest freshwater lake in China,during the period from Jan. 2005 to Dem. 2006. Age groups ranged between zero and six, with the second and third year - classes dominating. Standard length of the population is mainly between 120 -200 mm （75.21%）, and body weight is mainly between 30 -150 g （76.03%）. The results showed that the diameters of scale take on linear relationship with standard length, L = 58. 788 8 ＋ 20. 467 5 ＊ SL. The regression equation for standard length and body weight is W = 3.1 x 10^-6L3.297 5 . Growth takes on a constant speed style, which can be described with von Bertalanffy equations, namely standard length growth equation： L1= 327.348 7 ＊[1 -e^-0.2112＊（1＋1.074 5）], body weight growth equation： W1= 608. 988 7 ＊ [ 1 -e^-0.2112＊（1＋1.074 5）]3 2975. The body weight growth inflexion point is 4.57 ,with the corresponding standard length of 228.08mm and body weight of 184.98g. According to the growth characteristics of C. erythropterus in lake Poyang,we could understand the using situation and protect the fish resources rationally.