Chef Hayes, The two grouper species I am familar with are Black (very rare) and red. They each have sub Species Jewfish, Nassau,red,red hind, warsaw and yellow edge. A grouper in fact is one of over 400 kinds of sea bass (Serraind). The only other one I know is GAG or grey grouper,but it is not a true grouper. I am not familar with the blue grouper, so I can not answer for sure.
I hope this helps alittle
From what I can tell, the "bluenose grouper" is something that appears to me made up by some Chicago restauranteers for their menus. I can't find any species called this. I would be skeptical of whether it is really a grouper or not unless it is a "blue grouper".
The "blue grouper" which is a common coral reef food fish commonly sold in Hong Kong
What is this Bluenose Grouper....is it a seafood plot....is it really a fish. The term Grouper was added to the term Bluenose to help American's identify with the fish. Bluenose (Hyperoglyphe Antarctica)is actually from the rudderfish family species. It has a firm texture and medium color that whitens when cooked. It is only found in in New Zealand and Australia.