Meghan Holst studies the broadnose sevengill shark, so she was naturally concerned when record-setting rain this year altered the shark's nursery grounds in San Francisco Bay.
But the species appears to have withstood the challenge, based on initial observations from a recent outing on the water by Holst, a 31-year-old doctoral student in conservation ecology at the University of California, Davis.
San Francisco Bay is one of the world's only known year-round nurseries for the species, Holst said, making the habitat critical to monitor. The sevengill, known for its thick body, broad head and blunt snout, measures up to 10 feet long and eats various fish including other shark species and rays, dolphins, seals and other prey. As its name indicates, it has seven gills, while most shark species possess five.
"That's something I'm really interested in and looking at is where are they going when maybe the water is too fresh in San Francisco Bay for them and they might get pushed out," Holst said from aboard her research vessel in the bay. "So the fact that they're here today is awesome." Up early, they motor through tides on frequently foggy mornings, navigating secret fishing spots to drop anchor.
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