Catch: Top Predators (IMAGE) University of Washington Caption 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 Usage Restrictions Credit required License Licensed content 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.