This yellow jacket found it's way into my tank!! I wonder what would happen if a fish got stung by it? I removed it but it may just have been the first post on R2R about a fish getting stung by a bee!!
I don't think it would be possible unless the fish were out of the water. The yellow jacket can't swim, and the saltwater would kill them if they tried to. Not sure what would happen if they did get stung though.