Ahi, Ono, mahi, Ulua

Above is a list of fish available to my brother an A nonnie.
I know that the Ahi is a tuna which should be fine.
The Mahi is Mahi- Mahi which is good.
Ono is a mackeral, I suspect that is alright.
The last one Ulua I can't seem to find.
thanks,

Have you looked on http://www.fishbase.com ? It shows the colloquial names, local names, what the same fish is called wherever it's found.

Fish, fruit and veggies are the worst to identify if you don't happen to live in the US. I wish there was a fruitbase and a vegbase!  :D