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📘 How did we track great white sharks?

Your boat rocks as a great white’s fin cuts through the water. Then it disappears. A tag can turn that instant into a record of one shark’s movement—but every point still has gaps and uncertainty.

4
lessons
~20 min
to learn
Adults
level
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What you’ll learn

  1. A shark is a moving animal, not a fixed dotExplain why individual identification and uncertainty are foundational to shark tracking.Tracking begins with a known animal and records that keep gaps and confidence visible.
  2. Tags turn fin sightings into data streamsDistinguish SPOT, pop-up archival, and acoustic tags by the data each can provide.Different tags exploit a surfaced antenna, stored dive records, or a coded underwater ping.
  3. The routes overturned an old pictureUse tracking examples to connect migration, route fidelity, and ocean-scale habitat use.Long journeys and repeated routes reveal movement while leaving the reasons to test.
  4. From tracks to protectionInterpret a public tracking map without confusing a sample or estimate with a complete live route.Tracks become conservation evidence when methods, uncertainty, sampling limits, and management context stay visible.

Questions this course answers

Why can a SPOT tag on a great white shark transmit only intermittently?

A fin-mounted SPOT tag communicates when its antenna is exposed to air; a great white can remain underwater without surfacing to breathe.

What is a key difference between a pop-up archival tag and a SPOT tag?

Pop-up archival tags preserve records such as depth and temperature, then transmit after floating to the surface; SPOT tags can send positions when exposed.

Why should a public tracker icon not be read as a perfect live location?

Transmission opportunities, device limits, and location uncertainty mean an icon summarizes evidence rather than showing a continuous camera feed.

Which conclusion is strongest when many tagged sharks repeatedly use the same region?

Repeated use can identify a conservation-relevant pattern, but it does not establish exclusivity, complete abundance, or motive.

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