Tai is a commonname containing a variety of different fishes in the Pagellus catagory. The English commonname is (red), (blackspot) sea bream. I think this is not a very prominent fish in the US since I don't see them being advertised a lot in Japanese restaurants here.
Probably one of the reason it did not get as popular in US is because of its inflexibility in the use of the fish as a cooking ingredient. It is a shiromi (white meat fish) and is mild in taste. Since sashimi in US has to ...