Mangrove Box Jellyfish

There were lots of T. Cystophora. This is my first time encountering them. Many were active in the waters on the shores of Lake Wyman and amongst the mangroves. I personally collected about 40-50. While I was in the water I saw many more. There were probably several hundred there. I combed back and forth in a 500ft area. Tide: heading to high tide. Weather was clear, rain storms earlier. Moon Cycle: charts say crescent, 10%.