It's fascinating (to me) that a crustacean can survive 14 days in copper. And a freshwater dip. Possibly they are protected by their exoskeleton because there are anecdotal reports of shrimp surviving when someone doses copper into their DT.
I've been doing research lately on "prazi resistant flukes", and in at least some cases it appears monogeneans "shield" themselves from medications by sheltering under a fish's scales. Whether this is done purposely or they just happen to be in the right place at the right time, I do not know. But I wonder if an isopod might develop a similar strategy to avoid contact with chemicals that would otherwise kill it.
And unfortunately, I do not know the life cycle of parasitic isopods. I will have to look that one up.
