---
title: Oblique-Banded Cardinalfish (Apogon semiornatus)
scientific_name: Apogon semiornatus
common_name: Oblique-Banded Cardinalfish
taxon: Cardinals
conservation_status: LC - Least Concern
published: 2024-11-08T11:00:28.174Z
updated: 2025-11-25T13:58:09.000Z
tags: Oblique-Banded Cardinalfish, Apogon semiornatus, Cardinals, Red Sea, Marine Life, Diving
url: https://redseacreatures.com/taxon/fishes/bony-fishes/cardinals/oblique-banded-cardinalfish
---

# Oblique-Banded Cardinalfish (*Apogon semiornatus*)

**Taxon:** Cardinals (*Apogonidae*)  
**Conservation Status:** LC - Least Concern  


The Apogon semiornatus, commonly known as the oblique-banded cardinalfish, exhibits a translucent appearance highlighted by a prominent stripe, frequently red in color, with minimal to no additional striping, although individuals without stripes have been observed. This species is associated with marine reef environments in tropical regions, typically inhabiting depths ranging from 5 to 30 meters and reaching a maximum size of 7 centimeters.

Adapted to rocky and rubble reef ecosystems, the oblique-banded cardinalfish demonstrates secretive behavior, often seeking refuge under materials or in the recesses of low caves. While these fish may live solitarily, they are occasionally encountered in small groups.

This species is predominantly found inshore and exhibits a carnivorous diet. As mouthbrooders, they engage in distinct pairing during courtship and spawning processes.

Geographically, the distribution of Apogon semiornatus spans the Indo-West Pacific region, from the Red Sea and the Gulf of Oman extending south to Natal, South Africa, and eastward to the western Pacific, including areas from southern Japan to Australia.

---

*Source: [Red Sea Creatures](https://redseacreatures.com/taxon/fishes/bony-fishes/cardinals/oblique-banded-cardinalfish)*
*Updated: November 25, 2025*