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🌊 Marine Least Concern 🍽️ Edible 🌡️ Subtropical

Giant kelpfish

Heterostichus rostratus Girard, 1854
Max Length
61 cm
Max Weight
Lifespan
4 yrs
Trophic Level
3.9
Depth
0–40 m
Climate
Subtropical
Resilience
Medium
Vulnerability
41.00/100
Typical Length
Depth Zone
demersal

📖 Overview

Occurs in intertidal and to 40 m . Found among rocks with large seaweeds, often in kelp. Young occur in schools while adults are solitary. Feeds on small crustaceans, mollusks and small fishes. Female attaches eggs to seaweeds, male guards them.

Scientific Name
Heterostichus rostratus
Authority
Girard, 1854
Habitat
Marine
Climate
Subtropical
IUCN Status
LC
Max Length
61 cm
Lifespan
4 years
Depth Range
0–40 m
Trophic Level
3.9
Resilience
Medium
Vulnerability
41.00/100
Salinity
30–40 ppt

🔬 Taxonomy

🐟 Physical Description

Physical description for Giant kelpfish is currently being compiled.

🌀 Behaviour

Behavioural data for Giant kelpfish is currently being reviewed.

🦐 Diet

The giant kelpfish is a carnivorous bottom-feeding species. Its diet consists of small crustaceans, mollusks, and other fishes. It has a terminal mouth, a characteristic of ambush predators. Kelpfish larvae eat items such as single celled algae and mollusk larvae.

🥚 Reproduction

Reproduction data for Giant kelpfish is currently being compiled.

🌍 Habitat & Distribution

Marine; demersal; depth range 0 - 40 m . Subtropical; 42°N - 14°N, 125°W - 92°W

🌿 Ecology

Zone Preferences
🌊 Marine ⬇️ Benthic
Trophic Level
3.9±0.62
🐠 Schooling 🧍 Solitary
Food Items

small crustaceans, mollusks and small fishes

📐 Morphometrics

Length–Weight Relationship: W = 0.00513 × L3.07 (TL)
Max TL
61cm

🌡️ Water Parameters & Tolerance

Salinity Range
30–40ppt

🛡️ Conservation Assessment

IUCN Category
Least Concern
Assessment Date
2010

📊 Population Risk & Fisheries

Population Resilience
Medium
Minimum doubling time
Fishing Vulnerability
41.00/100
Moderate vulnerability
Trophic Level
3.9
Predator
Climate Zone
Subtropical
Described By
Girard, 1854

🍽️ Edibility & Flavour

"Giant kelpfish is an edible species."

✗ Not for Raw
✓ Fresh Indicators
  • Clear, bright eyes — cloudy eyes indicate age
  • Firm flesh that springs back when pressed
  • Fresh ocean smell, never strong or ammonia-like
  • Bright red or pink gills, not grey or brown
  • Shiny, moist skin with scales tightly attached
✗ Avoid If
  • Cloudy or sunken eyes
  • Strong fishy or ammonia odour
  • Soft, mushy flesh that doesn't spring back
  • Discoloured or dry flesh
Best Cooking Methods
Baking Grilling Pan-frying

Nutrition

Per 100g cooked — Source: USDA FoodData Central

Nutrient Amount
Protein 18.9 g
Omega-3 (total) 209 mg

🔬 Mercury Safety

Mercury data for Giant kelpfish has not yet been assigned. Please consult FDA/EPA guidance for general seafood safety advice.

🌿 Sustainability

Best Choice
Healthy stocks, low impact
Good Alternative
Well-managed, minor concerns
Use Caution
Check sourcing and season
Avoid
Overfished or high impact

🗺️ Global Occurrence Map

Occurrence records from the Global Biodiversity Information Facility (GBIF) — 13 records indexed .

Occurrence density from GBIF View GBIF records ↗

👥 Community & Contribute

Aquareap Community Observations
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