| 邹远超,岳兴建,王永明,覃川杰,齐泽民,谢碧文,王淯.2014.切尾拟鲿的个体生殖力.动物学杂志,49(4):570-578. |
| 切尾拟鲿的个体生殖力 |
| Individual fecundities of Pseudobagrus truncatus |
| 投稿时间：2013-10-23 修订日期：2014-04-30 |
| DOI：10.13859/j.cjz.201404014 |
| 中文关键词: 切尾拟鲿 个体生殖力 岷江 |
| 英文关键词:Pseudobagrus truncatus Individual fecundities Minjiang river |
| 基金项目:四川省教育厅科技创新科研团队基金项目;四川省教育厅项目 |
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| 中文摘要: |
| 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566～6 758粒，平均为3 056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 = 16 370.714 3 284.028 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 = 138.590 837.641GSI，(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。 |
| 英文摘要: |
| There were 63 female Pseudobagrus truncatus which ovaries at stage Ⅳ collected from the Yangtze River’s tributaries-MinJiang river in April-May 2013. The data for body length （L） , body weight （M） , net body weight （W） , ovary weight （Wa） were measured. The lapilli were used to determine the ages and egg diameters were measured with the aid of a vernier calipers. Counted with gravimetric method, the individual absolute fecundity （F） was obtained, and used for calculating 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 relationships between the individual fecundity and the morphological indices of 63 female specimens of P. truncatus were studied. The results showed that the ages of the specimens ranged from 2 to 5 years old（Table 1）. The individual absolute fecundity （F）, ranged from 566 to 6 758 eggs （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 （average 145 eggs）(Fig. 3). The absolute fecundity and length relatively fecundity were power correlated with body length, body weight and coefficient of maturing, respectively. While weight relative fecundity was only power correlated with the coefficient of maturing, but not correlated with other morphological indices. Multi-regressive analyses showed that the individual absolute fecundity was significantly correlated with body weight and coefficient of maturing, the relative fecundity per centimeter was significantly correlated with body weight, net weight and coefficient of maturing, while the relative fecundity per gram was only correlated with coefficient of maturing. The multiple stepwise regression equation were as follow: F = 16 370.714 3 284.028 GSI 58.361 M，（n=63, R2 = 0.973, P < 0.01）; FL = 251.749 18.961 M 684.273 W 3 268.421 GSI，（n=63, R2 = 0.852, P < 0.01）；Fw = 138.590 837.641GSI，（n=63,R2 = 0.539, P < 0.01）. The distribution of egg diameter showed that P. truncatus was the fish with onetime spawner a year. |
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