A study by researchers at Trinity College Dublin and the University of Pretoria has found that great white sharks are being pushed to their "physiological limits" due to warming ocean waters. The research suggests that warm-blooded fish species, which include great whites, shortfin makos and salmon sharks, burn about four times more energy than cold-blooded ones and will be increasingly forced into cooler regions with less food. This group represents 0.1% of all fish species. The study also provides an explanation for long-observed patterns in the oceans where larger fish tend to inhabit cooler, deeper waters, often migrating seasonally to find favorable conditions.