[The longfin smelt’s] decline has been attributed to construction and water diversion, which have slashed freshwater flow into the bay by roughly 53 percent — and by more than 70 percent in the winter and spring in recent years.
“The longfin smelt’s catastrophic decline is yet another sign that water diversions from the rivers that feed the bay are unsustainable,” said Jon Rosenfield, senior scientist for Baykeeper.
Source: San Francisco Examiner