鄱阳湖黄鳝的生长特征

The Growth Characteristics of Monopterus albus in Poyang Lake

以基舌骨和脊椎骨作为年龄鉴定的材料，研究了鄱阳湖黄鳝（Monopterus albus）种群的生长特征。结果表明，种群的年龄结构分别为：雌性1～5龄，雄性2～6龄，2～5龄为黄鳝性别的过渡期（间性）。2～4龄为优势年龄组，占渔获物的89．75％，相对应的体长为30～50cm，体重为30～120g。体长（L）与体重（W）的关系为：W=0．0004L^3.2601（♀）；W=0．0014L^2.9008（♂）。按生长指标值分析，阶段生长可以明显地划分为两个时期，即2龄前的生长迅速期和2龄后的生长稳定期。拟合的Von Bertalanffy生长参数分别为雌性L∞=78．5cm，k=0．17402／y，t0=-1．2032y，W∞=602．01g；雄性L∞=102．3cm，k=0．11845／y，t0=-1．3101y，W∞=947．32g；生长特征参数分别为φ=3．0303（♀）和φ=3．0934（♂）；雌雄个体生长差异显著。

Monopterus albus, belonging to Synbranchidae, Synbranchiformes, is an economically important species in southeastern Asia for food production, which undergoes natural sex reversal from female via intersex into male during its life. Some studies have been performed on the biology and ecology characteristics of M. albus, but no information on the growth characteristics of M. albus in Poyang Lake has been published. In this study, age and growth characteristics were studied based on 244 specimens of M. albus collected from the Poyang Lake from September, 2006 to August, 2007. Ages were determined by reading annuli on basihyal and vertebrae. The estimated age ranges were between 1 - 5 years for female, 2 - 6 years for male and 2 - 5 years for intersex. The individuals from two to four years old were dominant and represented 89.75% of total catch of the fish. Within the age interval, the body length of each individual was from 30 to 50 cm. The body length and body weight were in the relation of power function. The relationship of body length to body weight was W = 0.000 4L^3.2601 （♀） , and W = 0.001 4L^2.9008 （♂）. The growth parameters used to fit the Van Bertalanffy equation were L∞ = 78.5 cm, k = 0. 174 02/y, t0 = - 1.203 2 y, W∞ =602.01 g for female and L∞ =102.3cm, k=0.11845/y, t0= -1.3101 y, W∞ =947.32g for male. The growth performance indices were φ = 3.030 3 （♀） and φ = 3.093 4 （♂）. There was a significant difference in growth between the female and male.