I’m not sure if this is a new addition because of a patch – haven’t seen them there before today – but Juvenile Armorfish have moved out of the old sewers and can now be found in the same area as Juvenile Blue Jellyfish south and west of the Wreckage of the Breachmaker POI.
Also, on a related note, it doesn’t appear as though you can slide down to Sharkmaw Caverns (for the Juvenile Shark) anymore without dying – so bring a revive orb. (I’m sure there will be someone who says it is still possible, but I’ve tried probably 25 times and died every time – and I used to be able to do it consistently – so, whatever …).