Ya I read those before. But still think it is a different fish. Maybe some years later
some expert claim them to be different again. If I am not wrong aimara when small do not have the spot.
the above is said to be hoplias.macrophtalmus at 18cm
It look more like aimara to me.
and this above is a sp. too bad I dun know jap. Should be interesting to know what they means.
To me even if I know by studying on the jaw will able to tell the different. But from my own study it is from the spot or the thick bar across the body.