New Zealand provides data on reef shark populations near islands in Pacific Ocean . `` We estimate that reef shark numbers have dropped substantially around populated islands , generally by more than 90 % compared to those at the most untouched reefs , '' said lead author Marc Nadon from the Joint Institute for Marine and Atmospheric Research at the University of Hawaii . Marine scientists find reef shark populations dramatically reduced around inhabited islands . Over 100 species make up study which forms part of NOAA Pacific Ocean program .
New Zealand provides data on reef shark populations near islands in Pacific Ocean . Marine scientists find reef shark populations dramatically reduced around inhabited islands . Over 100 species make up study which forms part of NOAA Pacific Ocean program .