Moonfish (Lampris guttatu) were tagged for study. From November 21st, after the fish return to depth with its tag, until December 13th, the opah stayed within the depth range of 50-450m. It never came to the surface during this period. However, beginning December 13th, the daily depth pattern changes dramatically, it reached the surface every day and occasionally made deep dives reaching over 500m. Image courtesy of Exploring the Census of Marine Life 2002/2003 Expedition, NOAA-OER.