Location and timing of Asian carp spawning in the Lower Missouri River
Location and timing of Asian carp spawning in the Lower Missouri River
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DOI：
10.1007/s10641-012-0052-z
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发表时间：
2013-05-01
影响因子：
1.4
通讯作者：
McElroy, Brandon
中科院分区：
文献类型：
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作者：
Deters, Joseph E.;Chapman, Duane C.;McElroy, Brandon
2005年5月至7月和2006年5月至6月，我们在密苏里河下游和6条支流的12个地点取样了亚洲鲤鱼（鳙鱼、鲢鱼和草鱼）的卵，以研究产卵活动的时空动态。我们将卵子分为30个发育阶段，但通常无法将其区分为物种。我们估计产卵时间和地点根据发育阶段，温度依赖的发展速度和水流速度。产卵率在白天05:00 ~ 21:00时高于夜间。产卵并不局限于少数地点，如在长江中所报道的那样，这些鱼是本地的，但更多的卵产卵在高弯曲的地区。我们采用泥沙运输模型来估计密苏里河产卵期间卵的垂直浓度分布和总卵通量。在本研究中，我们没有在支流或支流汇合处发现大量的产卵活动。
We sampled for eggs of Asian carps, (bighead carp Hypophthalmichthys nobilis, silver carp H. molitrix, and grass carp Ctenopharyngodon idella) in 12 sites on the Lower Missouri River and in six tributaries from the months of May through July 2005 and May through June 2006 to examine the spatial and temporal dynamics of spawning activity. We categorized eggs into thirty developmental stages, but usually they could not be identified to species. We estimated spawning times and locations based on developmental stage, temperature dependent rate of development and water velocity. Spawning rate was higher in the daytime between 05:00 and 21:00 h than at night. Spawning was not limited to a few sites, as has been reported for the Yangtze River, where these fishes are native, but more eggs were spawned in areas of high sinuosity. We employ a sediment transport model to estimate vertical egg concentration profiles and total egg fluxes during spawning periods on the Missouri River. We did not identify substantial spawning activity within tributaries or at tributary confluences examined in this study.