Scientists question indicator of fisheries health, evidence for 'fishing down food webs'

Nov 17, 2010
A tuna is landed by a longline vessel in South African waters. Credit: Ed Melvin/Washington Sea Grant

The most widely adopted measure for assessing the state of the world's oceans and fisheries led to inaccurate conclusions in nearly half the ecosystems where it was applied according to new analysis by an international team led by a University of Washington fisheries scientist.

"Applied to individual ecosystems it's like flipping a coin, half the time you get the right answer and half the time you get the wrong answer," said Trevor Branch, a UW assistant professor of aquatic and fishery sciences.

In 1998, the journal Science published a groundbreaking paper that was the first to use trends in the trophic levels of fish that were caught to measure the health of world fisheries. The trophic level of an organism shows where it fits in food webs, with at a trophic level of one and large predators such as sharks, halibut and tuna at a trophic level of around four.

The 1998 paper relied on four decades of catch data and averaged the trophic levels of what was caught. The authors determined those averages were declining over time and warned we were "fishing down the " by overharvesting fish at the highest trophic levels and then sequentially going after fish farther down the food web.

Twelve years later, newly compiled data has emerged that considers such things as the numbers and types of fish that actually live in these ecosystems, as well as catch data. An analysis in the Nov. 18 issue of Nature reveals weaknesses in assessing ecosystem health from changes in the trophic levels of what is being caught.

If humans were fishing down the marine food web then catches of top predators, at trophic levels 3.5 and above, would be decreasing. But catches at those levels have generally increased according to newly compiled information. Named next to each trophic level is the species most often caught, for example bigeye tuna is the most often caught fish at level 4.5. The wider the line, the more fish are being caught at that trophic level. Credit: Trevor Branch/U of Washington

"This is important because that measure is the most widely adopted indicator by which to determine the overall health of ," said Branch, lead author of the new analysis in Nature. Those involved with the U.N.'s Convention on Biological Diversity, for instance, chose to use the average trophic level of fish being caught as the main measure of global marine diversity.

An example of the problem with the measure is in the Gulf of Thailand, where the average trophic level of what is being caught is rising, which should indicate improving ecosystem health according to proponents of that measure. Instead, it turns out fish at all levels have declined tenfold since the 1950s because of overharvesting.

"The measure only declines if fisheries aimed for top predators first, but for the Gulf of Thailand the measure fails because fisheries first targeted mussels and shrimps near the bottom of the food web, before shifting to predators higher up in the food web," Branch said.

Including the Gulf of Thailand, Branch found that changes in the average trophic levels of what was being caught and what was found when fish populations were surveyed differed in 13 of the 29 trawl surveys from 14 ecosystems. Trawl surveys, generally done from research vessels, count the kinds and abundance of fish and are repeated over time to reveal trends.

Branch and his co-authors are the first to combine so many trawl surveys for analysis – no one had combined more than a handful before. The trawl survey data came from efforts started three years ago by fisheries scientists and ecologists gathered at the National Center for Ecological Analysis and Synthesis in Santa Barbara, Calif. They brought together worldwide catch data, stock assessments, scientific trawl surveys, small-scale fishery data and modeling results. What emerged is the most comprehensive set of data yet for fisheries researchers and managers.

The gray line represents the average trophic level of what was caught worldwide starting in 1950 according to a 1998 Science paper about fishing down the marine food web. Newly revised and updated information, the black line, shows that the average trophic level of what is being caught has, instead, been generally going up since the mid 1980s. Credit: Trevor Branch/U of Washington

It paints a different picture from previous catch data and has revealed another major new finding: On a global scale humans don't appear to be fishing down the , Branch said.

The new catch data reveal that, following declines during the 1970s in the average trophic levels of fish being caught, catches of fish at all trophic levels have generally gone up since the mid-80s. Included are high-trophic predators such as bigeye tuna, skipjack tuna and blue whiting.

"Globally we're catching more of just about everything," Branch said. "Therefore relying on changes in the average trophic level of fish being caught won't tell us when fishing is sustainable or if it is leading to collapse." That's because when harvests of everything increase about equally, the average trophic level of what is caught remains steady. The same is true if everything is overfished to collapse. Both scenarios were modeled as part of the Nature analysis.

"The 1998 paper was tremendously influential in gathering together global data on catches and trophic levels and it warned about fishing impacts on ecosystems," Branch says. "Our new data from trawl surveys and fisheries assessments now tell us that catches weren't enough. In the future we will need to focus our limited resources on tracking trends in species that are especially vulnerable to fishing and developing indicators that reflect abundance, biodiversity and marine ecosystem health. Only through such efforts can we reliably assess human impacts on marine ecosystems."

"In this paper we conducted the first large-scale test of whether changes in the average trophic levels of what is caught are a good indicator of ecosystem status," says Beth Fulton, a co-author and ecosystem modeler with the Commonwealth Scientific and Industrial Research Organisation, Australia. "Catch data might be easiest to get, but that doesn't help if what it tells us is wrong. Instead we really need to look directly at what the ecosystems are doing."

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User comments : 2

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xznofile
not rated yet Nov 17, 2010
Standard catch method samples are needed. Probably the cheapest way to employ sampling is with the help of fishing companies who'll have to be sold on the idea of following procedures that limit their catch. Otherwise someone like NOAA will have to find funding for it.
jsa09
not rated yet Nov 17, 2010
I think if they look at one extra variable that would be expenditure per fish caught expressed in terms of hours of fishing per meter of net of fishing line used.

Cannot use dollars because the big boats they use these days are cheaper and more efficient than a fleet of small ships. But if we measure net-in-water time and compare that should be reasonable comparison.