Selected tag(s): Science study

New Study Supports Conservation Benefits of Catch Shares

RodFRod Fujita, Ph.D
Director, Ocean Innovations
Environmental Defense Fund

A new study released today (Essington, 2009) supports the results of other studies showing the benefits of catch share management in fisheries (Costello et al., 2008; Heal and Schlenker 2008).

The paper looks for a response in biomass, exploitation rate, discards, effort, compliance with catch targets and landings in 15 North American catch share fisheries.

The paper did not find that these catch share fisheries, on average, reduced overall landings or that they increased biomass.  That seems to be because most of these fisheries were not overfished–so the overall catch would not be expected to go down, and biomass would not be expected to increase, because these were not management goals.  To test the hypothesis that catch shares can rebuild depleted populations, it will be important to analyze depleted fisheries, over rebuilding time frames.  In this study, only one of the 8 fisheries that had explicit overfishing targets was substantially overfished.

The study did show that catch share fisheries moved landings, exploitation rates, and biomass levels closer to their targets, whether they were above or below the targets.  Since some of the fisheries were above and some were below, these changes averaged out, resulting in small net changes.  The exception was discard rate, which appears to have dropped by about 30% in the small number of fisheries examined. Read More »

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Is the Debate Over?

As originally posted on Grist.org

Diane Regas, Associate Vice President - EDF Oceans ProgramIn the current issue of Science twenty-one leading ocean scientists declared a truce—it’s as if Wile E. Coyote and Roadrunner agreed to stop the chase for a day. The paper was authored by many of the biggest names on all sides of the debate on ending overfishing—Boris Worm, Ray Hilborn, Andy Rosenberg and Chris Costello. So what are the terms?

First, they agree on what I will call a “Goldilocks” catch level (You know—not too hot, not too cold, but just right.) If we fish too much, then fish get smaller, catch levels eventually go down and lots of species end up on the road to ruin. If we fish too little, we can keep the fish in the oceans healthy, but fish for people goes way down. Fishing just right would mean aiming to catch about 20 percent of ocean fish every year. At that level, fish would be bigger, the long term catch would be stable at a high level, and the news for ecosystems—whales, dolphins, and turtles—would be good too; at least 90% of species would be at healthy levels-which is quite a bit better than we are doing now.

The second part of the paper is where the scientists waded into the hot debate on what management works to get to the Goldilocks level. The scientists looked at the big ocean places that are making progress and asked managers what worked. The first thing they found was that most places use a mix of approaches for the mix of ecosystem types-so there is not a panacea. Pretty much everyone will agree to that.

What comes out on top, though? It comes down to effectively implementing caps on catch levels using two key tools: reducing the Total Allowable Catch and putting in place catch shares. (You can look at their table where a solution was identified in at least five of the ten fisheries, and was usually ranked an “essential” part of the solution.) This is strong stuff!

There are lots of questions yet to answer—like why is it that a catch share program always had a reduced allowable catch level? Is the theory right that catch shares make it easier to set the catch level properly? And what makes it possible for enough stakeholders to agree to close off areas of the ocean? What are the keys to community co-management, which seems to work in small-scale fisheries? I expect that the scientists will go back to their corners and duke out those questions. I can’t wait.

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