Global Catch Share Fisheries Map (image) Environmental Defense Fund Caption Twenty-25 percent of global fish landings by volume and 15-20 percent by value are managed under catch shares. More information is available at http://www.fisherytoolkit.edf.org. Credit ©Environmental Defense Fund Usage Restrictions Give credit to ©Environmental Defense Fund Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.