Time may be running out for California’s most infamous fish.
Federally endangered delta smelt that were hatched at the UC Davis Fish Conservation & Culture Lab are transferred to a holding tank at the Aquarium of the Pacific in Long Beach. Despite a decades-long rescue effort, the tiny delta smelt appears closer than ever to vanishing from its only natural home, the Sacramento-San Joaquin Delta.Now, some worry it won’t be long before the only place the once-abundant species exists is within the confines of an artificial tank.
The prospect of extinction may seem unduly pessimistic to some, but the Aquarium of the Pacific in Long Beach announced recently that it had acquired 1,200 delta smelt from a UC Davis research hatchery. Puzzled visitors, he said, would “go on to learn how the life cycle of the delta smelt is intertwined with the past, present and future of California’s food and water story.”
The delta smelt’s current predicament stems largely from the rise in delta water exports, which have degraded the delicate estuary system it calls home — an environment where incoming saltwater from the San Francisco Bay mixes with out-flowing freshwater from the Sacramento and San Joaquin rivers. Scientists are hoping that freshwater dropped during this winter’s unusually heavy rainy season will result in an uptick in the number of delta smelt.“Delta smelt are at the lowest levels we’ve ever seen,” said Carl Wilcox, delta policy advisor for the state Department of Fish and Wildlife. “But we haven’t yet reached the point where we’d recommend building a hatchery capable of producing enough of the fish to make it feasible to reintroduce them to the wild.
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