When hunting at night, the dinicthoid can pulse with bioluminescence to take on the appearance of a smaller, more docile creature to lure prey closer. Conversely, it can control its markings to appear even larger and fiercer.

Its head features two large, protruding red eyes that can see for long distances under water in dim light. It also features a disconcertingly humanoid false face, (used to befuddle or frighten would-be predators), that is created by folds at the top of the skull. (Read more)
Scientists continue to marvel at the ferocity of the fish. Pandoran biologists recently watched as an unlucky young sturmbeest waded into a small pond to drink, only to be dragged beneath the surface by a school of ambitious dinicthy.
Such dramatic violence has led scientists to fear that the fish might be smuggled back to private aquariums on Earth. Should this occur (followed by the inevitable release of the fish into sewers or canals) the consequences for our already-distressed ecosystems are dire.