Black bullhead

Quick facts

Adult size

30 cm, 600 g typical harvest weight

Days to harvest

365 to 730 days from fingerling

Lifespan (max)

up to 10 years

Diet

omnivore

Temperature class

warm-water

Difficulty

beginner

Water parameters

Temperature range

4–32°C (optimum 24°C)

pH

6.5 to 8.5

Hardness

5 to 30 dGH

Minimum tank

300 L per individual at harvest size

Feed and growth

Feed protein

32% target

Daily feed (warm water)

1.80% of body weight per day

Daily feed (cool water)

0.60% of body weight per day

Max stocking density

50 g per litre of system water

A 600g adult eats about 10.8 g of feed per day at optimum temperature. For a roster of 10 fish at adult size, that's around 108 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 central and eastern North America, from the Great Lakes south through the Mississippi basin and into the Gulf Coast drainages. The species (Ameiurus melas) is a small, robust catfish found in ponds, marshes, slow streams, and lake margins with muddy or silty substrates. Adults typically reach 15–30 cm and 200–500 g, considerably smaller than channel catfish. Black bullheads are among the most tolerant freshwater fish in North America: they survive dissolved oxygen near zero (they can absorb some oxygen through the skin and buccal cavity), temperatures from 4°C to 35°C, high turbidity, and polluted water that would kill most other cultured species. They're omnivorous bottom-feeders that eat insects, crustaceans, mollusks, plant material, carrion, and detritus. The flesh is white and mild when taken from clean water, though fish from muddy ponds can have an off-flavor.

Climate and outdoor ponds

Climate classification

temperate (handles seasonal swings)

Outdoor pond zones (USDA)

4 to 11 (winter low around -34°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 small, extremely hardy catfish option for aquaponics in regions where channel catfish aren't available or where a smaller, more resilient species is needed. Growth is slower and maximum size is considerably smaller than channel catfish: expect 200–400 g harvest weight in 12-18 months. FCR on commercial catfish pellet (28-32% protein) is approximately 2.0-2.5, less efficient than channel catfish. The overwhelming advantage is toughness: black bullheads survive water quality excursions that would kill channel catfish, tilapia, or trout. Temperature tolerance spans 4–35°C. Dissolved oxygen can approach zero temporarily without mortality (though growth stops entirely and chronic low oxygen stunts them). This makes them suited to systems with inconsistent management, marginal infrastructure, or extreme climate conditions. Stocking density: 10-15 g/L. Fingerlings are available from bait shops, farm supply stores, and state hatcheries across the Midwest and eastern US. Legal in most states without permits. The flesh is acceptable table fare from clean water systems but less desirable than channel catfish; the smaller fillet size limits commercial market appeal. Best suited for personal consumption rather than market sales. A practical choice for cold-climate, low-budget aquaponics where system reliability matters more than production efficiency.

Further reading

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