Crosshatch Triggerfish

Crosshatch Triggerfish

The Crosshatch Triggerfish (Xanthichthys mento) is one of the most beautiful and best-behaved triggerfish in the hobby. Males are especially spectacular, their bodies covered in a neat blue-grey cross-hatch pattern and edged with yellow fins and a yellow-margined tail. Like its close relative the blue-throat trigger, it is a peaceful, plankton-feeding species — a rare reef-safe member of an otherwise rambunctious family.

A cooler-water, deeper-living trigger, it is prized both for its looks and its manners, and can be kept as a striking male–female pair.

Natural Habitat & Origin

Xanthichthys mento is found in the Pacific, often in cooler, current-swept waters around offshore reefs and rocky areas, where it hovers in open water feeding on drifting plankton. It shelters in holes and crevices in the reef when threatened.

In the aquarium it appreciates open swimming space combined with rockwork it can dart into, and tolerates — even prefers — the cooler end of the reef temperature range.

Care Requirements

Maintain stable marine conditions: salinity around 1.024–1.026, pH 8.1–8.4, and a temperature toward the cooler end of the range, around 23–26°C (73–79°F). Reaching about 30 cm (12 inches), it needs a roomy tank of around 450 litres (about 120 US gallons) or more with open water to swim. It is a hardy, adaptable fish that settles well and feeds readily.

Diet & Feeding

The Crosshatch Triggerfish is essentially a planktivore, far less destructive than triggers that crush hard-shelled prey. Offer a varied diet of frozen mysis and enriched brine shrimp, finely chopped seafood, krill and quality marine pellets, with some marine algae content, fed a couple of times a day. It is an easy, enthusiastic feeder.

Behavior & Temperament

This is a comparatively peaceful triggerfish, especially when young, though it can become a little more assertive with age and is best regarded as semi-aggressive. It mixes well with robust tankmates and can be kept as a male–female pair in a large tank. It spends much of its time cruising open water rather than excavating the substrate.

Tank Mates

Good companions are other robust, non-timid marine fish — tangs, larger wrasses, angelfish and similar. Avoid very small, shy fish. Unusually for a trigger, it is reef-safe: it leaves corals alone and is far less likely than other triggers to attack ornamental shrimp, crabs and snails, though caution with small mobile invertebrates is still sensible.

Breeding

Xanthichthys mento is a pelagic spawner and is not bred in the home aquarium, so trade specimens are wild-collected.

Common Health Issues

The Crosshatch Triggerfish is hardy but, like all marine fish, can be affected by marine ich (Cryptocaryon irritans) and marine velvet (Amyloodinium ocellatum), particularly when stressed. Quarantine new arrivals and keep water quality stable. Given open swimming space, cooler stable water and a varied diet, it is one of the most beautiful and best-behaved triggers — and one of the very few suited to a reef.