Count Every Fin

The sharks are being counted — by people like you.

For most of history, the only shark census was a grim one: fins on drying racks, carcasses on weigh-in docks, landing slips in a fisheries office. That has changed. Today the largest shark-monitoring workforce on Earth holds no degrees and draws no salary. It is made of divers with cameras, fishers with tagging kits, lifeguards with binoculars, schoolchildren with buckets, and beach walkers who phone in what they see — and their counts are rewriting what science knows about the oceans oldest predators.

Count Every Fin tells the story of that quiet revolution in forty chapters, one project, method, species or counting community at a time:

❦ Know one shark from another — whale shark spot patterns matched by a NASA star algorithm, white shark fin libraries, and the named individuals whole towns follow for decades

❦ Count from shore and sky — South Africas Shark Spotters, drone patrols over Australian surf, spotter planes over Cape Cod, and the Shark Lab that found a white shark nursery hiding beside Californias busiest beaches

❦ Follow the tags — the fisher-run tagging programme running since 1962, seabed listening stations serviced by volunteers, and the tracker generation that follows named sharks by phone

❦ Read the water itself — a litre of seawater holding the DNA of every shark that swam by, volunteer sampling days, sawfish hotlines, and DNA barcodes exposing shark sold under false names in fish markets

❦ See what the counts changed — shark sanctuaries drawn on real maps, the 2022 CITES listing of an entire shark family, and the dive clubs, girls science clubs and Indigenous ranger programmes doing the counting

Every chapter closes with a simple invitation: how you could take part, from the beach, the boat, the classroom or the shore. You do not need a research vessel. You need eyes, a notebook, and a coastline.

The census of living sharks has begun. Count every fin.

Maya Lindgren writes narrative popular science about the people who watch over wild animals — and the ordinary observers whose records protect them.