After mystery sea star die-off, could captive breeding rebalance California’s underwater forests?

Without sea stars, an explosion of sea urchins knocked the ecosystem off balance. Now scientists are racing to breed a new generation of their predators.

An ochre sea star tries to blend into a kelp forest off Point Loma, California. All 20 species of west coast sea stars suffered during the die-off, which began in 2013.

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