Black triggerfish

A group of black triggerfish gather in the waters off the Big Island of Hawaii
I came across this blob of black triggerfish just floating and weaving idly back and forth. Only the one had the coloration that is a sign of arousal and agitation, though it was drifting about much like the others. I suspect this was some sort of courtship/mating ritual going on, but it was quite ethereal to watch.

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