Khun Jeerachai,
on comment 219 What do you mean by JUNIOR?
Do you mean junior synonym? I think that's what you mean. The rule of zoological nomenclature is that the first name to be published is the senior synonym; any others are junior synonyms and should not be used. If ASTRONOTUS ORBICULATUS is a junior synonym of ASTRONOTUS OCELLATUS, then it should not be used but it's good to know that it exist. Anyway ,if it is a junior synonym, then it's the same species (just different name).
Tiger muskellung is a real hybrid between northern pike and muskellunge krub. The males are almost always sterile but the females are often fertile so they are not new species.They are just a hybrid. Maybe later (a very long time) on they might evolve to become an individual species when they get to the stage that they can interbreed and maintain their own traits and variation for several generations.