when settlers first inhabited the Moapa Valley and began using irrigation for agriculture. In the 1950s, several of the Muddy River's springs and tributaries — where Moapa dace swam — became swimming ...

A member of the Cyprinidae family and the sole species in the genus Moapa, the Moapa dace lives only in the warm springs of the upper Muddy River and has a distinctive leathery appearance — hence the ...