Species include angelfish, goatfish, butterflyfish, and parrotfish. These predators threaten native reef fish such as parrotfish and goatfish. For example, the yellowfin goatfish school with blue-striped snappers. The yellowfin goatfish is a reef-associated species. The yellowfin goatfish ("Mulloidichthys vanicolensis") often schools with the blue-striped snapper. The goatfish are presumably a more preferred prey than bluestripe snapper. The goatfish school alongside the snapper, with this behavior attributed to predatory protection. Other fishes, such as goatfish, frequently follow foraging rays, seeking food missed by the ray. "P. upenei" was found parasitizing the Sulphur goatfish ("Upeneus sulphureus"). The diurnal goldsaddle goatfish changes from a lemon-yellow to a pale cream when feeding. It has been treated as a subspecies of the blue-striped goatfish. Outside Europe, the Mullidae are often called "goatfish". Freckled Goatfish, "Upeneus tragula", develop barbels as a response to food availability. Other fish shadow the active goatfish, waiting patiently for any overlooked prey. Another farmed species was the popular, "mullus", the goatfish.