Silver carp

Quick facts

Adult size

100 cm, 4000 g typical harvest weight

Days to harvest

540 to 1095 days from fingerling

Lifespan (max)

up to 20 years

Diet

herbivore

Temperature class

warm-water

Difficulty

advanced

Water parameters

Temperature range

5–32°C (optimum 25°C)

pH

6.5 to 9

Hardness

5 to 30 dGH

Minimum tank

3000 L per individual at harvest size

Feed and growth

Feed protein

25% target

Daily feed (warm water)

1.50% of body weight per day

Daily feed (cool water)

0.60% of body weight per day

Max stocking density

25 g per litre of system water

A 4000g adult eats about 60.0 g of feed per day at optimum temperature. For a roster of 10 fish at adult size, that's around 600 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 large river systems in eastern China and eastern Russia, from the Pearl River north to the Amur. The species (Hypophthalmichthys molitrix) is a filter-feeding carp that strains phytoplankton from the water column using specialized gill rakers, consuming enormous quantities of microscopic algae. Together with bighead carp (which eats zooplankton), silver carp forms the filter-feeding component of traditional Chinese polyculture. Global production exceeds 5 million tonnes annually, almost entirely in China, making silver carp one of the most produced fish species in the world by tonnage. The species is notorious in North America as an invasive species: escaped silver carp in the Mississippi basin form massive populations and are famous for leaping meters out of the water when disturbed by boat motors, injuring boaters and damaging equipment.

Climate and outdoor ponds

Climate classification

temperate (handles seasonal swings)

Outdoor pond zones (USDA)

3 to 12 (winter low around -40°C or warmer)

Heating in a temperate climate

Not required (handles seasonal cool periods)

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 phytoplankton filter feeder that cannot eat pelleted feed, making it poorly suited to conventional aquaponics. Silver carp must be grown in water bodies with enough phytoplankton production to sustain them, which means fertilized ponds or eutrophic lakes. In typical aquaponics where the goal is clean, filtered water, silver carp would starve. In extensive pond-based integrated systems where green water and algal blooms are managed rather than prevented, silver carp serve as biological water quality managers that convert excess phytoplankton into fish biomass. Temperature range: 15–30°C, optimal at 25–28°C. Growth in productive water is fast: 1–3 kg in 12-18 months. In the US, silver carp culture is effectively prohibited in most states due to the catastrophic invasive impact in the Mississippi basin. Federal and state agencies spend hundreds of millions of dollars annually on Asian carp control. Even in states where silver carp culture might technically be legal, the regulatory environment is hostile. Where legal and ecologically appropriate (primarily China and Southeast Asia), silver carp are a high-volume, zero-input-cost protein source because they eat only natural plankton. Not recommended for any Western aquaponics application.

Further reading

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