I mentioned tilapia in this post.
Here is a variation on that theme. S: 黄立鱼; T: 黃立魚 (huáng lì yú). Yellow tilapia. This is a yellow bellied and yellow finned mutation of the common tilapia, Oreochromis mossambicus. It is otherwise identical in use and taste. Suddenly fashionable for no good reason that I can see.