…For the Devils Hole pupfish, a critically endangered species found only in a deep limestone cave in Death Valley, an earthquake signals that it’s time to do something a bit more intimate. Scientists say the fish’s likely response to the magnitude 7.0 earthquake, which rattled a large swath from San Francisco to Reno to southern Oregon, was to increase spawning activity to protect their population. … About two minutes after the earthquake, the water in Devils Hole — about 500 miles away from the quake’s epicenter — started flowing. Scientists estimate the waves, known as a seiche, were nearly 2 feet high. For the typically still-water environment, the waves disrupted the shallow shelf that the pupfish use as a spawning area, likely knocking eggs deep into the cavern.