By Nathan Frandino BERKELEY, California (Reuters) - Meghan Holst studies the broadnose sevengill shark, so she was naturally concerned when ...
STORY CONTINUES BELOW THESE SALTWIRE VIDEOSBERKELEY, California - 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.
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.
Holst and her crew count the shark's seven gills each time they catch a member of the species with rod and reel, using salmon as bait. The team collects all manner of data, taking blood and muscle biopsy samples, before releasing the sharks back into the bay. Many of these sharks were juveniles, much smaller than the full-grown adults.
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