| 摘要: |
| 于2001年4、5月份，从道观河水库中随机采集青梢鲌成熟雌体53尾，用鳞片鉴定年龄(A)，测量了体长(L)、体重(W)、净体重和性腺重(Wo)等形态学指标，计数个体绝对生殖力(F)，并计算出青梢鲌的体长相对生殖力(FL)、相重相对生殖力(FW)、肥满度(CF)和成熟系数(GSI)等，用8种数学模式及多元回归方程拟合了青梢鲌个体生殖力与形态学指标间的关系。结果表明，青梢鲌样本由1+-4+龄鱼组成；其个体绝对生殖力与体长、体重和年龄分别呈抛物线、幂函数和幂函数相关，相关式分别为：F = -1.032 + 0.00754L2 (n = 53，R2 = 0.6920, P < 0.01)，F = 0.0287W0.911 (n = 53, R2 = 0.7315, P < 0.01)，F = 0.339A1.489 (n = 53，R2 = 0.6211，P < 0.01)；体长相对生殖力与体长、体重和年龄分别呈对数函数、对数函数和直线相关，相关式分别为：FL = -4995.579 + 2001.462lnL (R2 = 0.7315，n = 53，P < 0.01)，FL = -1869.419 + 622.496lnW (R2 = 0.7315，n = 53，P < 0.01)；体重相对生殖力均值约219粒/g，变幅主要为150-300粒/g；多元逐步回归分析其绝对生殖力和体长相对生殖力均与多个指标密切相关，相关式分别为：F = -1.248 + 0.070GSI + 0.0571 square root(L*W) (n = 53，R2 = 0.8212，P < 0.01)，FL = -1050.940 – 26.756W + 46.031Wo + 97.941 square root(L*W) (n = 53，R2 = 0.7243，P < 0.01)；而体重相对生殖力仅与成熟系数有相关性：FW = 144.186 + 8.222GSI (n = 53，R2 = 0.3246，P < 0.01)。 |
| 关键词: 青梢鲌 个体生殖力 道观河水库 |
| DOI： |
| 分类号: |
| 基金项目:国家自然科学基金资助项目,39870597号 |
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| FECUNDITY OF CULTER DABRYI IN DAOGUANHE RESERVOIR, WUHAN, CHINA |
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WANG Yin-Dong1,2, XIONG Bang-Xi1, MA Xu-Fa1, XU Mu-Sheng3, ZHANG Lin-Lin3, WANG Xi-Bo4, HU Qiu-Sheng4
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1.The Fisheries College of Huazhong Agricultural University,Wuhan,430070;2.Fishery Research Institute of Anhui Agricultural Sciences Academy,Hefei,230031;3.Wuhan Water Resource Bureau,Wuhan 430000;4.Piscicultural Farm of Daoguanhe Reservoir,Wuhan,430400
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| Abstract: |
| Daoguanhe Reservoir (30°52′N, 114°59′E), situated in Wuhan, Hubei Province of China, is a middle-sized reservoir built in 1968. In normal condition, its maximum water depth is 78.7 m, in average of 10.3 m; water capacity is 0.64 × 109 m3; piscicultural area is 500 ha. Culter dabryi is a common economical fish in lake or reservoir in China from south to north, preying on small wild fish. Study on C. dabryi has so far not been reported overseas, to the best knowledge of the authors. Chinese researches have been conducted in morphology, food, distribution, scales, growth, and condition factor. C. dabryi was a common fish species and made up of 5% of total fish production in reservoir in China. However, the production has been declined in recent year due to natural factor and human activities. To find a solution to the problem, the fecundity of C. dabryi was studied in Daoguanhe Reservoir for remedying and developing the resource.
Fifty-three sexually matured specimens were collected in age of between 1 to 4 years, among them the number of 1+, 2+, 3+, and 4+ year-old were 14, 29, 7 and 3, respectively. The individual absolute fecundity of them was ranged 5 - 25 thousands eggs, averaged at 17.7 thousands eggs. The relative fecundity per centimeter was ranged 400 - 1200 egg/cm, and 857 eggs in average. The relative fecundity per gram was ranged l50-300 egg/g, in average of 219 egg/g.
Relationship between its absolute fecundity and body length, body weight and age were regressed in quadratic, exponential and exponential equation. Relationship between relative fecundity per centimeter and body length, body weight and age could be described by logarithmic and linear equation.
Multi-regressive analyses showed that both absolute and relative fecundities per centimeter are significantly related with several indices, such as length, weight, maturity, age and fatness, etc. However, the relative fecundity per gram was related with maturity only.
The individual fecundity could be estimated, and reproduction ability of fish population could be forecasted, according to the relationship between individual fecundity and morphological indices. From the result we knew that relationship between body weight and fecundity was closer than that of body length and age, so it is suitable using the body weight of C. dabryi to estimate the population productiveness. |
| Key words: Culter dabryi, Individual Fecundity, Daoguanhe Reservoir |
