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What that heck is on my urchin?? He has been carrying it around for almost a week and it has not moved. Its fluorescent and only appears yellow under blue light.
arg101 Thread
Dec 15, 2025
#hitchhiker
hitchhiker coral
hitchhiker id
hitchhikerid
hitchhikers
invasion
invasive
pest
snail
urchin
Replies: 3
Forum: Hitchhiker & Critter ID
I'm looking to ID this sponge I found growing underneath a rock. Is it likely an invasive sponge?
