400 foot long box jellyfish?

Question

On animal planet they just said that a full grown box jellyfish can reach lenths of 400 feet long. I dont see how this can be realistic. Does anyone have any information on this fact?

Answer 1

I'm guessing they meant the total length of all the tentacles added together.

There are up to 60 tentacles, and each tentacle can be over 9 feet in length, so it would be possible that all of them added together could equal even more than 400 feet.