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Eye-level close-up shot of a healthy vibrant royal blue tang swimming past live reef rock and soft corals in a crystal-clear marine aquarium under soft daylight LED spectrum.
Eye-level close-up shot of a healthy vibrant royal blue tang swimming past live reef rock and soft corals in a crystal-clear marine aquarium under soft daylight LED spectrum.
Explore Aquatic Care
Species Profile

Paracanthurus Hepatus Guide

Explore the comprehensive biological and anatomical characteristics of Paracanthurus hepatus, famously known as the regal blue tang. From its striking palette coloration to precise skeletal geometry, understand this iconic marine species.

Macro detail shot of the side profile of a royal blue tang, showing the iconic black palette pattern and vivid yellow tail fin against dark ocean water.
Macro detail shot of the side profile of a royal blue tang, showing the iconic black palette pattern and vivid yellow tail fin against dark ocean water.
Detailed close-up photo of marine fish scales and dorsal fin spines illuminated under clean blue aquatic lighting.
Detailed close-up photo of marine fish scales and dorsal fin spines illuminated under clean blue aquatic lighting.
Wide shot of a vibrant Pacific coral reef backdrop with marine fish swimming gracefully among colorful stony corals.
Wide shot of a vibrant Pacific coral reef backdrop with marine fish swimming gracefully among colorful stony corals.
Anatomy & Coloration

Distinctive Physical Markers

Pigmentation

Signature Coloration & Markings

Adult Paracanthurus hepatus feature a bright royal blue body marked by a broad black area that creates a distinct blue oval on each side. The caudal fin showcases a vivid yellow triangle framed by dark outer borders.

Skeletal Geometry

Skeletal & Scale Structure

Characterized by a compressed elliptical body, terminal snout, and nine dorsal spines. Small scales possess short upper ctenii, while larger tuberculated bony plates cover the head between the eye and upper jaw.

Biogeography

Geographic & Light Variations

Regional variation occurs across populations: Indian Ocean specimens show yellow lower body coloration, while Pacific individuals remain blue. Furthermore, trunk blue pigmentation lightens significantly during nocturnal periods in response to melatonin levels.

Biological Metrics

Morphological Data

149.2 mm

Maturity Length

600 g

Average Mass

22

Vertebrae Count

9 / 3

Dorsal & Anal Spines

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