切尾拟鲿的个体生殖力  

Fecundity of Individual Fish Pseudobagrus truncatus

作　　者：邹远超[1] 岳兴建[1] 王永明[1] 覃川杰[1] 齐泽民[1] 谢碧文[1] 王淯[1] 

机构地区：[1]内江师范学院生命科学学院长江上游鱼类资源保护与利用四川省重点实验室,四川内江641112

出　　处：《动物学杂志》2014年第4期570-578,共9页Chinese Journal of Zoology

基　　金：四川省教育厅科技创新科研团队基金项目(No.KYTD201009);四川省教育厅项目(No.12ZB072)

摘　　要：于2013年4～5月在长江上游岷江河口区域采集63尾性腺发育至Ⅳ期的切尾拟鲿(Pseudobagrus truncatus)雌性个体,所有样本均测量其体长(L)、体重(M)、净体重(W)和性腺重(Wa)等生物学指标。取耳石鉴定年龄,测量卵径,用重量法计数个体绝对生殖力(F),并对体长相对生殖力(FL)、体重相对生殖力(FW)进行计算,用5种数学模型及多元逐步回归方程拟合个体生殖力与生物学指标的关系。结果显示,调查样本由2+～5+龄组成,个体绝对生殖力(F)为566～6758粒,平均为3056粒;体长相对生殖力(FL)68～469粒/cm,平均为234粒/cm;体重相对生殖力(FW)为45～349粒/g,平均为145粒/g。个体绝对生殖力(F)和体长相对生殖力(FL)与体长(L)、体重(M)和成熟系数(GSI)均呈幂函数相关;而体重相对生殖力(FW)仅与成熟系数(GSI)呈幂函数相关,和其他形态指标的相关性不显著。多元逐步回归分析结果表明,长江上游切尾拟鲿个体绝对生殖力(F)与体重(M)和成熟系数(GSI)密切相关,相关式为:F=16370.714+3284.028 GSI+58.361M(n=63,R2=0.973,P<0.01);体长相对生殖力(FL)与体重(M)、净体重(W)和成熟系数(GSI)密切相关,相关式为:FL=251.749+18.961 M+684.273 W+3 268.421 GSI(n=63,R2=0.852,P<0.01);而体重相对生殖力(FW)仅与成熟系数(GSI)相关:FW=138.590+837.641 GSI(n=63,R2=0.539,P<0.01)。依据卵径频数分布结果推测,切尾拟鲿属于一次性产卵鱼类。Total of 63 female Pseudobagrus truncatus whose ovaries at stage Ⅳ were collected from the Yangtze River’s tributaries-Minjiang river from April to May in 2013. The body length（ L）,body weight（ M）,net body weight（ W）,ovary weight（ Wa） of the sampled fish were measured. The age of sampled fish was determined by lapilli,egg diameters were measured by vernier caliper. The individual absolute fecundity（ F）was obtained by gravimetric method,then it was used to calculate the relative fecundity per centimeter（ FL）,relative fecundity per gram（ FW）,coefficient of maturing（ GSI）,fullness（ K）,and other indices. Based on these measurements and calculations,the relationship between the individual fecundity and the morphologicalindices of 63 female specimens of P. truncatus was studied. The results showed that the age of the specimens ranged from 2＋to 5＋years old（ Table 1）. The individual absolute fecundity（ F） ranged from 566 to 6 758eggs（ average 3 056 eggs）. The individual relative fecundity per centimeter（ FL） ranged from 68 to 469 eggs（ average 234 eggs） and the individual relative fecundity per gram（ FW）,ranged from 45 to 349 eggs（ average145 eggs）（ Fig. 3）. The absolute fecundity and length relatively fecundity was power correlated with body length,body weight and maturing coefficient（ GSI）,respectively. While weight relative fecundity was only power correlated with the maturing coefficient（ GSI）,but not correlated with other morphological indices.Multi-regressive analysis showed that the individual absolute fecundity was significantly correlated with body weight and maturing coefficient（ GSI）,the relative fecundity per centimeter was significantly correlated with body weight,net weight and maturing coefficient（ GSI） while the relative fecundity per gram was only correlated with maturing coefficient（ GSI）. The multiple stepwise regression equation were as follow： F =16 370. 714 ＋ 3 284. 028 GSI ＋ 58. 361 M（ n = 63,R2=

关 键 词：切尾拟鲿 个体生殖力 岷江 

分 类 号：S917.4[农业科学—水产科学]