Shark numbers show marine reserves helping MARINE reserves really do help preserve shark numbers, new research by The University of Western Australia has shown. Using novel stereo video technology, the researchers studied reef shark populations in Fiji's largest marine reserve and found the number of sharks in the no-take area was two to four times greater than in adjacent areas where fishing was allowed. "The study not only provides evidence that Fiji's largest marine reserve benefits reef sharks, but achieves this in a non-destructive manner using novel stereo video technology," PhD student Jordan Goetze said. A lot of previous studies have used long-lines to estimate shark abundance and biomass, which often results in the animals being killed or harmed. Shark populations are declining worldwide because of strong demand for shark products, particularly fins for Asian markets. While Fijians consider sharks to be sacred, higher prices for shark products are driving some locals to catch the ancient predators.