Free Newsletters - Space - Defense - Environment - Energy - Solar - Nuclear
by Rob Jordan for Stanford News
Stanford CA (SPX) Mar 24, 2014
Seabirds, sea turtles and marine mammals such as dolphins may not appear to have much in common, other than an affinity for open water. The sad truth is that they are all unintended victims - by-catch - of intensive global fishing. In fact, accidental entanglement in fishing gear is the single biggest threat to some species in these groups.
A new analysis co-authored by Stanford biology Professor Larry Crowder provides an unprecedented global map of this by-catch, starkly illustrating the scope of the problem and the need to expand existing conservation efforts in certain areas.
"Some of the earliest by-catch issues involved marine mammals taken in purse seines (large nets with floats) and shrimp trawls that drowned sea turtles," said Crowder, who is the science director at the Center for Ocean Solutions and a senior fellow at the Stanford Woods Institute for the Environment. "The problems were ultimately solved by scientists who clearly defined the problems and by managers and fishermen who sought innovative fishing methods to allow fisheries and protected species to coexist."
During the past half-century, fish hauls around the world have increased from about 19 million tons per year to more than 154 million tons per year. Beyond the problem of overfishing - more than 60 percent of sea creatures brought up are classified as overfished or collapsed stocks - by-catch can lead to "major changes in ecosystem function and process," the study's authors write.
By-catch also damages fishing gear and wastes fishermen's time and money. Accurate data on global by-catch are hard to find because of the need for trained on-ship observers across vast oceans.
To fill the gap, Crowder and Rebecca Lewison, the lead author of the paper and a co-leader of the study, directed a research team that looked at hundreds of peer-reviewed studies, reports and symposia proceedings published between 1990 and 2008 to obtain a global perspective on what kinds of animals were being caught, where they were being caught and the types of gear in which they were trapped. They then compiled all of this information into a single comprehensive map and dataset.
"It highlights the importance of looking at the by-catch issue across different species, fishing gears and countries," said Lewison, an ecology professor at San Diego State University. "When you do that, it makes it clear that to address by-catch, fishing nations need to work together to report and mitigate by-catch. No single country can fix this."
The study revealed by-catch hotspots and gaps in available data, such as the lack of information on small-scale and coastal fisheries and many ocean regions that are heavily fished by commercial fleets. Among the findings:
+ Marine mammal by-catch is highest in the eastern Pacific and the Mediterranean.
+ Sea turtle by-catch is most prevalent in the southwest Atlantic, eastern Pacific and Mediterranean oceans.
+ Seabird by-catch is highest in the southwest Atlantic and Southern Indian oceans.
Expanding the use of by-catch mitigation tools such as turtle excluder devices is only part of the solution, according to the study's authors. Community engagement is key in less-regulated, small-scale fisheries. To make meaningful headway, researchers and managers need more data on the extent and distribution of global fishing.
"Reducing by-catch levels in coastal fisheries sectors will require coordination across national boundaries using integrated approaches that link conservation action with sustaining human livelihoods, incentives and commitment to protecting the environment," the study's authors wrote.
This study is part of a research initiative funded by the Gordon and Betty Moore Foundation. Rob Jordan is the communications writer for the Stanford Woods Institute for the Environment.
Stanford Woods Institute for the Environment
Farming Today - Suppliers and Technology
|The content herein, unless otherwise known to be public domain, are Copyright 1995-2014 - Space Media Network. All websites are published in Australia and are solely subject to Australian law and governed by Fair Use principals for news reporting and research purposes. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA news reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. Advertising does not imply endorsement, agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. Privacy Statement All images and articles appearing on Space Media Network have been edited or digitally altered in some way. Any requests to remove copyright material will be acted upon in a timely and appropriate manner. Any attempt to extort money from Space Media Network will be ignored and reported to Australian Law Enforcement Agencies as a potential case of financial fraud involving the use of a telephonic carriage device or postal service.|