User blog comment:Lord Loss/Monster Hunter Theory... Blog/@comment-11075144-20130727180927/@comment-5043481-20130814200014

I don't see why it would be using photosynthesising algea when it live in the deep ocean, where it is dark. Also, those green patches are on its belly where the least light would reach them.

I also think it would be entierely possible for a ceadeus to hold it's breath for a few days never mind hours. Whales hold vast quantities of dissolved oxygen in thier muscles, I see no reason why Ceadeus could not do the same.