Scientists Question Widely Adopted Indicator of Fisheries Health and Evidence for
'Fishing Down Marine Food Webs'
ScienceDaily (Nov. 18, 2010) - 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 microscopic algae 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 food web" 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
"This is important because that measure is the most widely adopted indicator by which
to determine the overall health of marine ecosystems," 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.
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 food web, 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 fish 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."
Other co-authors are Reg Watson and Grace Pablico, University of British Columbia;
Simon Jennings, Centre for Environment, Fisheries and Aquaculture Science and University of East Anglia, England;
Carey McGilliard, University of Washington; Daniel Ricard, Dalhousie University in Halifax, Nova Scotia; and Sean
Tracey, University of Tasmania, Australia.
The work was supported by the National Science Foundation, Gordon and Betty Moore
Foundation and the UW School of Aquatic and Fishery Sciences. It used data from the National Center for Ecological
Analysis and Synthesis working group, used the stock assessment database funded by the Canadian Natural Sciences
and Engineering Research Council and the Canadian Foundation for Innovation and used data from the Sea Around Us
project funded by Pew Charitable Trust.
The above story is reprinted (with editorial adaptations by ScienceDaily staff) from materials provided by
University of Washington.
1.Trevor A. Branch, Reg Watson, Elizabeth A. Fulton, Simon Jennings, Carey R. McGilliard, Grace T. Pablico, Daniel
Ricard, Sean R. Tracey. The trophic fingerprint of marine fisheries. Nature, 2010; 468 (7322): 431 DOI:
2.D. Pauly. Fishing Down Marine Food Webs. Science, 1998; 279 (5352): 860
University of Washington (2010, November 18). Scientists question widely adopted indicator of
fisheries health and evidence for 'fishing down marine food webs'. ScienceDaily. Retrieved November 19, 2010, from