Adults are found mostly on sandy bottoms near shore to 183 m depth. Juveniles are common beyond surf line, larvae settling in bays and estuaries . Adults feed during the day on fishes and squids, often well off the bottom. An important sport and commercial fish. They are caught with trammel nets . Marketed as fresh fillet . Adults migrate to shallower waters to spawn . Has very sharp teeth and is known to bite if handled .
Behavioural data for California flounder is currently being
reviewed.
🦐 Diet
small fish
crustaceans
cephalopods
🥚 Reproduction
📦 Batch Spawner
Size at Maturity
47.3cm TL
Distinct pairing . They are batch spawners that exhibit indeterminate fecundiity and undergo asynchronous ovarian development . Spawning interval is between 7 and 14 days while spawning frequency is around 12 to 13 times per year.
🌍 Habitat & Distribution
Marine; brackish; demersal; oceanodromous ; depth range 0 - 183 m , usually 0 - 60 m . Subtropical; 48°N - 24°N
Mexico
🌿 Ecology
Zone Preferences
🌊 Marine🌿 Brackish⬇️ Benthic
Migration
Oceanodromous
Trophic Level
4.5±0.63
📐 Morphometrics
Length–Weight Relationship:
W = 0.00646 × L3.13
(TL)
Max TL
152cm
Max Weight
33,000g
🌡️ Water Parameters & Tolerance
Salinity Range
30–40ppt
🛡️ Conservation Assessment
IUCN Category
Least Concern
Assessment Date
2007
📊 Population Risk & Fisheries
Population Resilience
Low
Minimum doubling time
Fishing Vulnerability
55.00/100
Moderate-High vulnerability
Trophic Level
4.5
Apex / Top predator
Body Shape
Short and / or deep
Climate Zone
Subtropical
Described By
Ayres, 1859
⚠️ Venom Profile
Medical Warning: This species is venomous. Seek immediate medical attention
if envenomated.
Contact emergency services and follow first aid guidance below.
Venom Type
proteinaceous neurotoxin
Delivery
dorsal, anal, and pelvic fin spines
Potency
Severe
Mortality Risk
Low
Symptom Onset
5min
Duration
24.0hrs
Antivenom
✗ Not Available
Named Toxins
high-molecular-weight protein (Stonustoxin analogue)acetylcholine
Symptoms
immediate intense pain
swelling
erythema
occasional nausea and weakness
Affected Body Systems
peripheral nervous systemcardiovascular
First Aid
Immerse affected area in hot water (45 C, tolerable) for 30-90 minutes to denature toxin. Do not apply ice.
Medical Treatment
Analgesia; wound care; tetanus prophylaxis; severe cases may require monitoring for systemic effects.
References:
Compiled from Bhide (2018), Halstead et al. (1988) and family-specific envenomation literature
🎣 Angling Guide
Difficulty
Beginner
Fight Rating
strong pulls with head-shakes
Best Seasons
spring,summer,fall
Best Time
incoming tide, dawn and dusk
Line Weight
15-30
Rod Type
medium-heavy spinning
Hook Size
2/0-5/0
Catch & Release
✓ Recommended
Best Months
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Techniques
bottom fishingpopping corksoft plasticslive bait
Bait & Lures
live shrimpcut mulletsoft plastic paddle-tailspopping corks
Recommended Tackle
medium-heavy 7ft spinning rod
30-50 lb braid
fluorocarbon leader
Where to Find Them
grass flats
oyster bars
marsh drains
deeper channel edges
Tips & Tricks
Popping cork technique attracts fish from distance. Fish moving tides.
Catch & Release Tips
Use barbless hooks, minimise air exposure, and revive fish head-first in current before release.
Regulations Summary
⚠️
Slot limits protect breeding-size fish. Verify daily bag limits.
🍽️ Edibility & Flavour
"California flounder is an edible species."
✓ Suitable 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
BakingGrillingPan-frying
⚡ Nutrition
Per 100g cooked - Source: USDA FoodData Central
Nutrient
Amount
Protein
17.1 g
Omega-3 (total)
207 mg
🔬 Mercury Safety
Mercury data for California flounder 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
✓ Sustainable Choice
🔬 Full Nutritional Profile
Per 100g - Raw, per 100g
- Source: USDA FoodData Central templates (generic fish average)