Pursuant to the Endangered Species Act, in October 2019 the United States Fish and Wildlife Service (USFWS) of the Trump Administration issued a new Biological Opinion (BiOp) for coordinated operations of the Central Valley Project and the State Water Project (2019 USFWS BiOp). The 2019 USFWS BiOp issued by the Trump Administration found that anticipated water project operations would not jeopardize the survival of the endangered delta smelt, a fish species dependent on low-salinity conditions and found only in the brackish estuary where the freshwater of the Sacramento and San Joaquin Rivers mix with the seawater of the San Francisco Bay. The “no jeopardy” determination in the 2019 USFWS BiOp contrasted with the previous 2008 USFWS BiOp, which found that anticipated water project operations would likely push the endangered delta smelt into extinction due to elevated salinity levels.

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三角洲熔炼的鲑鱼课程：USFWS中对孵化场的不合理依赖2019年10月生物学观点

根据《濒危物种法》，2019年10月，特朗普政府的美国鱼类和野生动物服务局（USFWS）发布了新的《生物意见》（BiOp），以协调中央谷地项目和州水项目的运营（2019 USFWS BiOp） 。特朗普政府发布的2019 USFWS BiOp发现，预期的水利项目运营不会危及濒临灭绝的三角洲冶炼鱼的生存，这种鱼类依赖于低盐度条件，仅在萨克拉曼多和圣萨尔瓦多淡水的咸淡河口中发现华金河与旧金山湾的海水混合。与之前的2008 USFWS BiOp相比，2019 USFWS BiOp中的“无危险”决定，