1.Peacock Bass
2.Emperor Cichlid
3.Dovii
4.Umbii
5.Venezulan Pike
6.Black Belt
7.Jaguar
at this point, there are alot new world ciclids in the 12 to 15 inch range.
There are also many other cichlids that surpass the 15 inch range, lots of open water African Cichlids, talapia as well and multiple pikes and other new world cichlids that hit this range as well. Thats the best I have for now.
Oh, I forgot to say, the first two are debatable because some say Emp's get larger then Pcocks, but Trems are know to top 36 inches according to some. I myself believe it is a toss up with exceptions on both sides.