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首页> 外文期刊>San Francisco Estuary and Watershed Science >Pre-Screen Loss and Fish Facility Efficiency for Delta Smelt at the South Delta's State Water Project, California
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Pre-Screen Loss and Fish Facility Efficiency for Delta Smelt at the South Delta's State Water Project, California

机译：加利福尼亚南三角洲州水项目的三角洲冶炼厂的筛分前损失和鱼类设施效率

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Water exports have been implicated in the decline of fish populations in the upper San Francisco Estuary, California. We evaluated the relation between delta smelt salvage at the John E. Skinner Delta Fish Protective Facility (SFF) and underlying entrainment losses at the State Water Project (SWP, south Delta). We used cultured delta smelt in mark–recapture experiments in February and March 2009 (adults) and June 2009 (juveniles) to estimate: (1) the percent of fish recaptured at the SFF of the total released at the entrance of the SFF (fish facility efficiency), (2) the percent of fish recaptured at the SFF of the total released in Clifton Court Forebay (CCF), a reservoir for SWP exports, and (3) the fish losses in CCF and before the SFF (pre-screen loss). Mean fish facility efficiency was lower in successive releases: February (53.2%), March (44.0%) and June (24.0%). The mean percent recapture of fish released at the CCF entrance was also lower over time: February (3.01%); March (0.41%) and June (0.03%). Correspondingly higher mean pre-screen losses occurred over time: February (94.3%); March (99.1%) and June (99.9%). We concluded that: (1) entrainment losses of delta smelt could be higher at times, compared to other species previously studied at the SWP; (2) pre-screen loss was the largest source of mortality for delta sme (3) increased release distance from the SFF and residence time in CCF—and decreased exports—resulted in a lower percentage of recaptured fish at the SFF; and (4) salvage of delta smelt at the SWP does not seem to be a consistent index of entrainment.
机译：加利福尼亚州旧金山上游河口的鱼类种群减少与水出口有关。我们评估了约翰·E·斯金纳三角洲鱼类保护设施（SFF）的三角洲熔盐救助与国家水计划（南部三角洲）的潜在夹带损失之间的关系。我们在2009年2月和2009年3月（成人）和2009年6月（幼鱼）的标记捕获实验中使用养殖的三角洲熔炼来估算：（1）在SFF入口处释放的鱼中，在SFF捕获的鱼中所占百分比设施效率），（2）在克利夫顿法院前海湾（CCF）（SWP出口的水库）释放的SFF中捕获的鱼的百分比，（3）CCF和SFF之前的鱼损失（预筛分）失利）。连续释放的平均鱼类设施效率较低：2月（53.2％），3月（44.0％）和6月（24.0％）。随着时间的推移，CCF入口处释放的鱼类的平均捕捞百分比也较低：2月（3.01％）; 3月（0.41％）和6月（0.03％）。随着时间的推移，发生相应的平均预筛查损失也相应增加：2月（94.3％）; 3月（99.1％）和6月（99.9％）。我们得出以下结论：（1）与之前在SWP上研究的其他物种相比，三角洲熔炼的夹带损失有时可能更高; （2）筛前损失是三角洲冶炼厂最大的死亡率来源; （3）与小规模渔业的释放距离增加，在CCF的停留时间增加，而出口量减少，导致小规模渔业重新捕获的鱼类百分比降低; （4）在SWP处回收δ熔炼似乎不是一致的夹带指数。

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