Common Names: Blue Jaw Triggerfish, Blue Chin Triggerfish, Guilded Triggerfish Latin Name: Xanthicthys auromarginatus Natural Range: Widespread in the Indo-Pacific, from The Great Barrier Reef to the reefs of Hawaii. Difficulty: Beginner/Easy. These triggers are very tolerant of water conditions, are disease resistant, and readily accept just about all foods. Size: Up to 14" in the wild, but generally 7-9" in captivity. Reef Compatibility: *With Caution* The Xanthicthys group of triggers are naturally planktivores in the wild, meaning they eat suspended food in the water coloumn. They do not naturally prey on inverts, fish, or corals. Though it is said there is a risk involved with inverts. I have never personally witnessed any type of predation on any of my ornamental shrimp, clean up crew, or small fish. Care Requirements: General parameters for fish only or reef (1.020-1.030 SG, PH of 8.0-8.4, temp of 75-82) is fine. The trigger is a omnivorous fish that will eat just about any meaty or veggie type food you add to the tank. They do get large and are very active swimmers, I would recommend a minimum of a 60" tank if kept permanently. Behavior, Captivity, and General Experience Notes: The blue jaw trigger can make an excellent addition to your large marine aquarium. Intelligent and personable fish, they are sure to be a highlight amongst your livestock. They can do well in groups, but only one male should be kept per tank. Sexing the fish is easy, as only the males feature the prominent blue chin. Breeding has not been observed in captivity, but in the wild, they build nests to lay and guard eggs in as with other triggerfish species. Definitely not a shy fish, the blue jaw will spend much of its time cruising the tank in the open. They are very easy to get hand feeding, and mine was eating from my hands within 24 hours of adding. They are very tolerant to water conditions, and very disease resistant, making them a good choice for the beginning aquarist. Triggerfish commonly vocalize, and mine can be heard "grunting" on occasion. The name "trigger" comes from their pectoral fin, which can be locked into a upright position. This is generally done while resting at night in the rocks, and makes it very hard for potential predators to remove the fish or swallow it.