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

🌊 Marine 🌡️ Temperate

Long barbeled grunter

Hapalogenys sennin Iwatsuki & Nakabo, 2005
Max Length
29.6 cm
Max Weight
-
Lifespan
-
Trophic Level
3.9
Depth
-
Climate
Temperate
Resilience
High
Vulnerability
26.00/100
Typical Length
-
Depth Zone
pelagic

📖 Overview

The species is apparently restricted to river mouths and coastal rocky to sandy bottoms of less than 50 m depth. The smallest specimen (MUFS 22226, 46 mm SL) was collected in a river mouth, while larger specimens were captured by set net or small trawl between 5-50 m depth over rocky or sandy bottoms. Between 1960-1980, the species were observed by Miyazaki SCUBA divers to be solitary and common in small caves, holes, and under overhanging rocks along the Nichinan coast, Miyazaki, southeastern Kyushu Island, from late summer to winter. However, in recent years (post 1990) the species has been only rarely observed .

Scientific Name
Hapalogenys sennin
Authority
Iwatsuki & Nakabo, 2005
Habitat
Marine
Climate
Temperate
Body Shape
Short and / or deep
Max Length
29.6 cm
Trophic Level
3.9
Resilience
High
Vulnerability
26.00/100
Salinity
30–40 ppt

🐟 Physical Description

Dorsal spines (total): 11; Dorsal soft rays (total): 16 - 18. Diagnosis. Distinguished from its congerners by the following: dorsal-fin rays XI, 16-18 (usually XI, 17); scales above lateral line 9-12 (usually 10 or 11), below 15-19 (usually 16 or 17); scales on maxilla absent; 10 pores on and behind chin, including one very smalei pore near each side of symphysis, two moderate sized pores anteroventrally on each dentary, a single large pore ventrally, midway along each dentary (usually obscured by dense papillae), and a single large pore ventrally at articulation of dentary (two posteriormost pores slit-like concave traces); cluster of short and long dense papillae and barbels on fleshy lower lip, its posterior part naked; shape of dorsal- and anal-fin rays strongly angulated, usually angular, anal more strong than dorsal; body uniformly dark brown, sometimes with two indistinct oblique dark bands, the first descending from nape to behind pectoral fin, the second from base of 7th-10th dorsal-fin spines, curving downward above or through lateral line .: short and / or deep; Cross section: compressed.

🌀 Behaviour

Behavioural data for Long barbeled grunter 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; pelagic-neritic; depth range ? - 50 m . Temperate Northwest Pacific: Currently known only from southern Japan except in the Ryukyu and Ogasawara isalnds.

🌿 Ecology

Zone Preferences
🌊 Marine 🐟 Pelagic
Trophic Level
3.9±0.6
🧍 Solitary

📐 Morphometrics

Length–Weight Relationship: W = 0.01862 × L3.01 (TL)
Max TL
29.6cm
Dorsal Spines
11
Dorsal Rays
17

🌡️ Water Parameters & Tolerance

Salinity Range
30–40ppt

📊 Population Risk & Fisheries

Population Resilience
High
Minimum doubling time
Fishing Vulnerability
26.00/100
Low vulnerability
Trophic Level
3.9
Predator
Body Shape
Short and / or deep
Climate Zone
Temperate
Described By
Iwatsuki & Nakabo, 2005

👥 Community & Contribute

Aquareap Community Observations
0 Observations logged on Aquareap

No observations yet - be the first to log one!

View all observations for Long barbeled grunter ↗
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.