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🌊 Marine Least Concern 🌡️ Temperate

Norway bullhead

Micrenophrys lilljeborgii Collett, 1875
Max Length
7.4 cm
Max Weight
-
Lifespan
-
Trophic Level
3.8
Depth
0–100 m
Climate
Temperate
Resilience
Medium
Vulnerability
31.00/100
Typical Length
6 cm
Depth Zone
demersal

📖 Overview

Found on hard bottoms (gravel or shells) or among algae with temperatures ranging below 0°C. Feeds on small crustaceans (amphipods, decapods) and fishes. Spawns in early spring. Eggs demersal, in clumps on bottom, diameter 2 mm; larvae pelagic .

Scientific Name
Micrenophrys lilljeborgii
Authority
Collett, 1875
Habitat
Marine
Climate
Temperate
IUCN Status
LC
Max Length
7.4 cm
Depth Range
0–100 m
Trophic Level
3.8
Resilience
Medium
Vulnerability
31.00/100
Salinity
30–40 ppt

🔬 Taxonomy

Genus
Micrenophrys
Micrenophrys
Species
Norway bullhead
Micrenophrys lilljeborgii

🐟 Physical Description

Differs from Taurulus bubalis by the row of bony knobs above the rough lateral line and by the 2 soft rays in the anal fin .

🌀 Behaviour

Behavioural data for Norway bullhead 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; brackish; demersal; depth range 0 - 100 m . Temperate; 66°N - 48°N, 25°W - 13°E Northeast Atlantic: Norwegian coasts to Namdahl to off Denmark, around British Isles and across to Iceland.

🌿 Ecology

Zone Preferences
🌊 Marine 🌿 Brackish ⬇️ Benthic
Trophic Level
3.8±0.62
Food Items

small crustaceans (amphipods, decapods) and fishes

📐 Morphometrics

Length–Weight Relationship: W = 0.00603 × L3.15 (TL)
Max TL
7.4cm

🌡️ Water Parameters & Tolerance

Salinity Range
30–40ppt

🛡️ Conservation Assessment

IUCN Category
Least Concern
Assessment Date
2013

📊 Population Risk & Fisheries

Population Resilience
Medium
Minimum doubling time
Fishing Vulnerability
31.00/100
Low vulnerability
Trophic Level
3.8
Predator
Climate Zone
Temperate
Described By
Collett, 1875

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