Jade perch

Quick facts

Adult size

40 cm, 800 g typical harvest weight

Days to harvest

365 to 540 days from fingerling

Lifespan (max)

up to 15 years

Diet

omnivore

Temperature class

warm-water

Difficulty

beginner

Water parameters

Temperature range

15–32°C (optimum 26°C)

pH

6.5 to 8.5

Hardness

5 to 25 dGH

Minimum tank

300 L per individual at harvest size

Feed and growth

Feed protein

36% target

Daily feed (warm water)

1.40% of body weight per day

Daily feed (cool water)

0.70% of body weight per day

Max stocking density

45 g per litre of system water

A 800g adult eats about 11.2 g of feed per day at optimum temperature. For a roster of 10 fish at adult size, that's around 112 g of feed daily.

Legality

Aquaculture and possession rules vary by jurisdiction and change over time. This table reflects regulations as of the verified date on each row. Verify with your local fisheries or wildlife authority before stocking.

Jurisdictions not listed here default to "check local regulations". A non-listing is not a green light; rules in your specific county or municipality may apply.

Habitat and origin

Native to inland river systems of central and northern Australia, including the Lake Eyre and Bulloo basins. The species (Scortum barcoo) is a freshwater terapontid found in turbid, warm river channels, waterholes, and floodplain lakes. Adults reach 4–5 kg in the wild, though aquaculture harvest size is typically 400–800 g. Jade perch is notable for having the highest omega-3 fatty acid content of any freshwater fish tested, which has driven interest in the species for health-conscious aquaculture markets. The flesh is white, mild, and firm. The species was developed for Australian aquaculture in the 1990s and has since been exported to aquaponics operations in the US, Europe, and Southeast Asia as a specialty food fish.

Climate and outdoor ponds

Climate classification

subtropical (tolerates mild cooling)

Outdoor pond zones (USDA)

9 to 13 (winter low around -7°C or warmer)

Heating in a temperate climate

Required for year-round operation

Cooling in a temperate climate

Not required

Zone bounds reflect year-round outdoor pond viability with no active heating. Anywhere outside the bounded zone, the species can still be kept in an indoor heated tank or a seasonally-managed system. Verify your specific microclimate, as a sheltered yard zone can run a half-zone warmer than the regional rating.

Care notes

A warm-water aquaponics species with a strong nutritional selling point: the highest omega-3 fatty acid content of any freshwater fish tested in laboratory analyses. Optimal temperature is 24–30°C, with a tolerated range of 12–34°C. Growth: 400–800 g in 12-18 months on commercial pellet (36-42% protein). FCR is approximately 1.5-2.0. Stocking density: 15-30 g/L. Jade perch tolerate a moderate range of water quality conditions: DO above 3 mg/L, ammonia below 1.5 mg/L, pH 6.5-8.5. They accept pellet feed readily when trained as fingerlings and are generally easy to manage in culture. The species handles crowding and handling stress better than most Australian native fish, which is advantageous in aquaponics where the system is regularly disturbed for maintenance, harvesting, and planting. Fingerlings are available from Australian hatcheries and, increasingly, from specialty suppliers in the US and Europe that have imported broodstock. Legal status outside Australia varies; check local regulations because jade perch is a non-native species in most countries and may require an import or aquaculture permit. In the US, several states allow culture; others have not yet ruled on the species. The omega-3 content provides a genuine marketing advantage: laboratory analyses consistently show 1,500-2,000 mg of omega-3 per 100 g of flesh, compared to 200-500 mg for tilapia or catfish. This positions jade perch as a premium health-food product, and the nutritional claim is verifiable and compelling for health-conscious consumers.

Further reading

• Aquaponics water chemistry: balancing pH for fish and plants
• Fish for aquaponics: tilapia vs everything else