---
title: Moustache Longfin (Plesiops mystaxus)
scientific_name: Plesiops mystaxus
common_name: Moustache Longfin
taxon: Longfins
conservation_status: LC - Least Concern
published: 2024-11-07T22:21:05.467Z
updated: 2025-11-25T13:58:09.000Z
tags: Moustache Longfin, Plesiops mystaxus, Longfins, Red Sea, Marine Life, Diving
url: https://redseacreatures.com/taxon/fishes/bony-fishes/longfins/moustache-longfin
---

# Moustache Longfin (*Plesiops mystaxus*)

**Taxon:** Longfins (*Plesiopidae*)  
**Conservation Status:** LC - Least Concern  


The Moustache Longfin (Plesiops mystaxus) is a tropical marine species that inhabits demersal zones at depths ranging from 1 to 8 meters. It can reach a maximum length of 9 cm. 

Adults predominantly reside in rocky or rubble substrates. Notably, the male parent assumes an active role in guarding the eggs. 

This species exhibits 12 dorsal spines and 7 dorsal soft rays, complemented by 3 anal spines and 8 anal soft rays. Its caudal fin is characteristically rounded. 

Geographically, the Moustache Longfin is distributed in the Western Indian Ocean, including the Red Sea, Comoros, Madagascar, and southern regions of Oman.

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*Source: [Red Sea Creatures](https://redseacreatures.com/taxon/fishes/bony-fishes/longfins/moustache-longfin)*
*Updated: November 25, 2025*