Do Guam mantas plan moon parties?

Several of Hartup's paddler and free diving friends told her about seeing mantas congregating purposefully in an area where surgeonfish were spawning. Since they were able to give her an exact date, Julie was able to calculate the moon phase, which is important as many fish synchronize their spawning with the moon. Using this information she predicted when the spawning event would occur that upcoming year and was there to witness a shoal of spawning surgeonfish accompanied by a fever of mantas.

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