Channel catfish

Quick facts

Adult size

55 cm, 1200 g typical harvest weight

Days to harvest

540 to 730 days from fingerling

Lifespan (max)

up to 15 years

Diet

omnivore

Temperature class

warm-water

Difficulty

beginner

Water parameters

Temperature range

10–32°C (optimum 27°C)

pH

6.5 to 8.5

Hardness

5 to 30 dGH

Minimum tank

400 L per individual at harvest size

Feed and growth

Feed protein

32% 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

50 g per litre of system water

A 1200g adult eats about 16.8 g of feed per day at optimum temperature. For a roster of 10 fish at adult size, that's around 168 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 rivers, lakes, and reservoirs across eastern and central North America, from the Great Lakes south to the Gulf of Mexico. The species (Ictalurus punctatus) is the most widely cultured food fish in the United States, with over 300 million pounds produced annually, primarily in pond-based operations across the Mississippi Delta region (Mississippi, Alabama, Arkansas). Bottom-dwelling, nocturnal feeders with exceptional olfactory senses; they locate food by smell and taste rather than sight, which is why they feed confidently in turbid water and at night. Tolerates poor water quality better than most cultured species: survives low dissolved oxygen (down to 1 mg/L briefly), moderate ammonia levels, and a pH range from 6 to 9. This tolerance makes them forgiving in aquaponics systems where parameter control is imperfect. Adults in culture reach 500–1 g in 12-24 months depending on temperature and feeding regime.

Climate and outdoor ponds

Climate classification

temperate (handles seasonal swings)

Outdoor pond zones (USDA)

5 to 11 (winter low around -29°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 solid choice for temperate aquaponics where tilapia isn't legal or where water temperatures fluctuate seasonally. Catfish grow well at 21–29°C and tolerate temperatures from 2°C to 35°C, though they stop feeding below about 10°C and above 32°C. Growth is slower than tilapia: 12-24 months to reach harvest size (500–800 g), depending on temperature and feed quality. FCR is 1.6-2.0 on commercial catfish pellet (32% protein). Stocking density for aquaponics should stay at 10-20 g/L; higher densities increase stress and disease risk. Catfish are bottom feeders; sinking pellets work better than floating feed, though they learn to eat at the surface over time. The barbels are sensitive taste and touch organs; maintain good water quality to prevent barbel erosion from bacterial infection. Legally available for aquaculture in most US states without special permits, which is a significant advantage over tilapia in restrictive jurisdictions. Fingerlings are widely available from farm supply stores, hatcheries, and online suppliers. Channel catfish produce substantial ammonia relative to body weight, which is beneficial for plant growth in aquaponics but requires adequate biofiltration to keep ammonia below toxic levels. Enteric septicemia of catfish (ESC, caused by Edwardsiella ictaluri) is the primary disease concern in culture; maintain water quality and avoid temperature stress to prevent outbreaks.

Further reading

• Fish for aquaponics: tilapia vs everything else