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Fishing ban brings species back to Mexico park. But can it rebuild a fishery?

A study finds that a fishing ban at a Mexican marine park – with critical help from local residents – has successfully restored the fish population. Whether it's enough to restore the industry is not clear.

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You can sunbathe, go kayaking or windsurfing, or try your hand at diving. No fishing. Period.

That, in effect, is the dictum residents of the tiny village of Cabo Pulmo, at the tip of Baja California, have enforced throughout a 27-square-mile patch of ocean that a decade ago was severely over-fished.

The patch is a national marine park that Cabo Pulmo's residents help oversee. And according to a new study of the impact of that no-fishing policy, fish populations have rebounded beyond anyone's wildest dreams.

The researchers conducting the work say they hope the results will do more than build momentum for more effective enforcement of marine reserves elsewhere in the Sea of Cortez. The research, they say, also highlights the positive effect that residents in comparable areas around the world can have when they buy into the concept of a ban on fishing.

Between 1999 and 2009, total fish biomass – an aggregate figure that accounts for the number and size of fish – grew by more than 460 percent, from roughly 600 pounds per acre to 3,392 pounds per acre, according to a study published recently in the on-line journal PLoS One, an on-line journal of the Public Library of Science.

And species – from top predators to tiny fish that feed on plankton and marine plants – have returned in proportions that resemble those found in ocean ecosystems that have escaped overfishing, signaling a biologically vibrant ecosystem, according to Octavio Aburto-Oropeza, leader of the team that conducted the study.


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