I was once told by a visiting alaskan fisheries biologist that deep inside a bloom you'll find a purple female moon jellyfish and that they are rare to see if diving. The reason for the congregation of such a dense amount of jellyfish in one area is mating. That means she's surrounded by thousands of male suitors. I often tell divers to look out for a purple jellyfish and with any luck you'll get to see her but the truth is its like looking for a needle in a haystack. One day while snorkeling with a large bloom I just happen to see her while photographing a lions mane jellyfish. We've had a few other guests catch a glimpse of this gal as well.