New 🐟 Mercury Safety Guide & Omega-3 Rankings Updated for 2026. View Omega-3 Rankings →

🌊 Marine Least Concern 🌡️ Tropical

Pacific mutton hamlet

Alphestes immaculatus Breder, 1936
Max Length
30 cm
Max Weight
-
Lifespan
-
Trophic Level
3.5
Depth
1–50 m
Climate
Tropical
Resilience
High
Vulnerability
32.00/100
Typical Length
18 cm
Depth Zone
demersal

📖 Overview

A shallow water, cryptically colored, secretive species that inhabits seagrass areas. Also found in rocky reefs in depths of 1-50 m . Sedentary during the day, hiding in crevices or lying among seaweed, and rely on their effective camouflage to escape detection. Sometimes partly covering itself with sand. Nocturnal predators feeding mainly on benthic crustaceans.

Scientific Name
Alphestes immaculatus
Authority
Breder, 1936
Habitat
Marine
Climate
Tropical
Body Shape
Fusiform / normal
IUCN Status
LC
Max Length
30 cm
Depth Range
1–50 m
Latitude
13°S – 32°N
Trophic Level
3.5
Resilience
High
Vulnerability
32.00/100
Migration
Non-migratory
Salinity
30–40 ppt

🔬 Taxonomy

🐟 Physical Description

Dorsal spines (total): 11; Dorsal soft rays (total): 17 - 19; Anal spines: 3; Anal soft rays: 9. Preopercle rounded, the posterior edge distinctly serrate, with a large spine (usually covered with skin) projecting downward and forward at the angle. Color in life: head and body marbled reddish brown, with obscure bars and small dark and pale spots all over the head, body and median fins. Pectoral fins with 7 or 8 irregular transverse series of small dark spots ; further characterized by having body depth less than or equal to head length, depth contained 2.3-2.8 times in standard length; caudal peduncle depth 11-12% of SL; eye diameter subequal to snout length, contained 4.1-5.5 times in HL; color in market: similar to color in life but color may fade to a buff, reticulations on pectoral fins usually remain .: fusiform / normal; Cross section: oval.

🌀 Behaviour

Behavioural data for Pacific mutton hamlet is currently being reviewed.

🦐 Diet

aquatic invertebrates
small fish
algae
detritus

🥚 Reproduction

🐣 Oviparous 📦 Batch Spawner
Spawning Season
spring-summer
Spawn Location
Pelagic
Fertilization
External

🌍 Habitat & Distribution

Marine; demersal; non-migratory; depth range 1 - 50 m . Tropical; 32°N - 13°S, 115°W - 76°W

🌿 Ecology

Zone Preferences
🌊 Marine ⬇️ Benthic
Migration
Non-migratory
Trophic Level
3.5±0.5
🌙 Nocturnal

📐 Morphometrics

Length–Weight Relationship: W = 0.01122 × L3.04 (TL)
Max TL
30cm
Dorsal Spines
11
Dorsal Rays
18
Anal Spines
3
Anal Rays
9

🌡️ Water Parameters & Tolerance

Salinity Range
30–40ppt

🛡️ Conservation Assessment

IUCN Category
Least Concern
Assessment Date
2016

📊 Population Risk & Fisheries

Population Resilience
High
Minimum doubling time
Fishing Vulnerability
32.00/100
Low vulnerability
Trophic Level
3.5
Predator
Body Shape
Fusiform / normal
Climate Zone
Tropical
Latitude Range
32°N – 13°S
Described By
Breder, 1936

🌐 Names & Taxonomy

Language Common Names
🇬🇧English Pacific mutton hamlet
🌍CES kanic mělčinový
🇫🇷French Varech Pacifique
🇮🇹Italian Cernia rana del Pacifico
🇵🇹Portuguese Garoupa-marmoreada-do-Pacífico
🇪🇸Spanish Cabrilla · Guaseta · Guaseta Del Pacifico · Guaseta Pacifico · Guaseta Pintilla · Guaseta cherna
🇨🇳Chinese 無斑鴛鴛鮨

Scientific Synonyms

Scientific Name Author Year Status
Alphestes fasciatus Hildebrand 1946 Synonym
Alphestes galapagensis Fowler 1944 Synonym

🗺️ Global Occurrence Map

Occurrence records from the Global Biodiversity Information Facility (GBIF) - 22 records indexed .

Occurrence density from GBIF View GBIF records ↗

👥 Community & Contribute

Aquareap Community Observations
0 Observations logged on Aquareap

No observations yet - be the first to log one!

View all observations for Pacific mutton hamlet ↗
Suggest an Edit

Spotted incorrect or outdated data? Submit a correction and our editorial team will review it. Approved edits go live within 48 hours.

Link to a scientific paper, FishBase, or other authoritative source
Report an Issue

Found a factual error, broken data, or inappropriate content? Let us know and we will investigate promptly.