Billfish: Battle on the Line -
changing seas

The unique oceanographic conditions of the eastern tropical Pacific make the area one of the best spots in the world for big game anglers to hook billfish. But intense pressures from commercial fishing operations have taken their toll on the numbers of sailfish and marlin in the region. Researchers are studying the animals to provide the data necessary to protect the fish populations from further decline.

Duration: 26 minutes and 46 seconds

Episode Number: 703

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About Changing Seas:

CHANGING SEAS takes viewers on an exciting adventure to the heart of our liquid planet.

The documentary series offers an unprecedented look at how oceanographers and experts study earth's vast underwater wilderness, while shedding light on how over-fishing, global climate change and pollution threaten ocean resources.