“On September 29, 2006, on board Oceanus, a 177-foot research vessel out of Woods Hole, Massachusetts, acoustic engineer Nicholas Makris captured an unusual reflection on his sonar screens. At first, a dark speck appeared off the northern flank of Georges Bank. The speck grew and grew, transforming into a teeming mass that stretched for 25 miles. On the screen, it appeared as a huge, undulating swarm that moved in sync—much like a boisterous crowd doing “the wave” around a football stadium. Underwater, hundreds of millions of shimmering Atlantic herring schooled together and then, just as quickly, dispersed into shallower waters for a night of “synchronized reproductive activities.””
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Fonte: Conservation Magazine