lol i caught 1 as soon as i got my fishing rod in bastok lol aswell as copper frogs and dark bass and my fishing skill is 0 all the fish and items i caught ppl are suprised lol....and u can also synth this with "copperi ingotx1, wind crystal" i did it
FYI: Items with stats such as this ( HP+1 MP-1 ) are unconditional.
When items such as an Astral Ring's ( Converts 25 HP to MP ) then you must have the "spare" HP (in this case) to be "converted." Actually, 1 extra is needed, 25 HP nothing happens (yes, theory) 26 HP, you get 1 HP, and 25 MP when the ring is equipped.