脆弱天堂 08

The waterjets break up the outline of the boat from below

And mimic the noise and commotion of baitfish when under attack.

Meanwhile, live baitfish are strewn around the boat to keep the tuna interested.

It may look like a lot of effort for a few fish

But this pole and line technique of fishing can be surprisingly effective.

Fishing for export is now big business in the tropical Pacific

With tuna alone accounting for 30 times more fish than

all the fish caught by subsistence fishermen.

So is commercial fishing sustainable?

Skipjack are the smallest

And by far the most abundant tuna species in the Pacific.

They reach maturity in just a year

And then spawn many times within a season.

They seem to be the perfect catch

As their numbers just keep bouncing back.

But not all marine life is so resilient.

Thanks to modern fishing

Some of the best-known animals of the Pacific are in deep trouble.