• Join Wild Chronicles along the Mekong River in Cambodia where National Geographic Emerging Explorer Zeb Hogan races against time to save the critically endangered giant catfish. Weighing in at more than 600 pounds, these behemoths may be the world's largest freshwater fish. But overfishing and dam building threaten to render this Mekong icon extinct.

    1. How much fish is harvested annually from the Mekong River?

      More than two million tons of fish are harvested from the Mekong River every year.

    2. The Mekong is home to more large fishes than any other river. Why?

      The size and length of the river provide fish plenty of room to grow.

    3. How do Zeb and other researchers estimate the number of giant catfish in the Mekong?

      Researchers base their estimates on the number of fish caught every year.

    4. Zeb does most of his work with the giant catfish in Cambodia. However, the fish's migration does not begin there. Where does it start?

      The only known spawning ground of the giant catfish is in northern Thailand.

    5. How is Zeb helping educate Cambodian children about the importance of the giant catfish?

      Zeb has produced an illustrated children's book about the migration of the giant catfish.

  • Term Part of Speech Definition Encyclopedic Entry
    critically endangered Noun

    level of conservation between "endangered" and "extinct in the wild."

    dam Noun

    structure built across a river or other waterway to control the flow of water.

    Emerging Explorer Noun

    an adventurer, scientist, innovator, or storyteller recognized by National Geographic for their visionary work while still early in their careers.

    extinct Adjective

    no longer existing.

    overfish Verb

    to harvest aquatic life to the point where species become rare in the area.

    render Verb

    to make, or cause to become.

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