Common name: Outrigger triggerfish

General information

The Blue-lined Triggerfish, scientifically known as Xanthichthys caeruleolineatus, is a vibrant and intriguing species popular among marine aquarium enthusiasts. This species is known for its striking blue lines that run horizontally across its body, complemented by a yellowish to olive green background. The males are particularly colorful, with blue throats that intensify during spawning periods, hence the alternative name Blue-throated Triggerfish.

Care

Blue-lined Triggerfish are relatively hardy and can adapt to life in captivity if provided with a spacious tank that mimics their natural environment. They require plenty of swimming space and rockwork or decorations to provide hiding spots. These fish are known to be somewhat aggressive, particularly towards smaller tank mates or those of similar shape, so careful selection of companions is crucial. A varied diet of meaty foods, including shrimp, squid, and fish, will keep them healthy and maintain their vibrant colors.

Reproduction

In the wild, Blue-lined Triggerfish form monogamous pairs during the breeding season. They are demersal spawners, meaning they lay their eggs on the substrate. The male guards the nest until the eggs hatch. While breeding them in captivity is challenging, understanding their natural spawning behavior can be beneficial for potential breeding attempts.

Habitat

Xanthichthys caeruleolineatus is found in the Indo-Pacific region, from East Africa to the central Pacific, including the Red Sea. They inhabit clear, outer reef environments and are often seen at depths ranging from the surface to over 50 meters. They prefer areas with strong currents and are adept at navigating the complex topography of coral reefs.