Hybrid sunfish

Lepomis macrochirus × Lepomis cyanellus

Also known as: Hybrid bluegill, Georgia giant, Hybrid bream

Plan a system with Hybrid sunfish

Quick facts

Adult size: 22 cm, 450 g typical harvest weight
Days to harvest: 365 to 540 days from fingerling
Lifespan (max): up to 8 years
Diet: omnivore
Temperature class: warm-water
Difficulty: beginner

Water parameters

Temperature range: 4–32°C (optimum 26°C)
pH: 6.5 to 8.5
Hardness: 5 to 20 dGH
Minimum tank: 400 L per individual at harvest size

Feed and growth

Feed protein: 36% target
Daily feed (warm water): 3.00% of body weight per day
Daily feed (cool water): 0.80% of body weight per day
Max stocking density: 30 g per litre of system water

A 450g adult eats about 13.5 g of feed per day at optimum temperature. For a roster of 10 fish at adult size, that's around 135 g of feed daily.

Habitat and origin

A cross between two sunfish species, most commonly green sunfish (Lepomis cyanellus) x bluegill (Lepomis macrochirus). The hybrid has been produced since the 1960s for pond stocking and aquaculture because it grows faster than either parent species and the sex ratio is heavily skewed toward males (90-95% male), which grow larger and don't divert energy to reproduction. Hybrid sunfish are stocky, deep-bodied panfish reaching 200–400 g in culture. The flesh is white, firm, and mild, comparable to bluegill. They're popular for recreational pond stocking in the US because they provide fast-growing, easily caught fish for family fishing ponds.

Climate and outdoor ponds

Climate classification: temperate (handles seasonal swings)
Outdoor pond zones (USDA): 4 to 10 (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 practical aquaponics alternative to bluegill with faster growth and built-in population control. Hybrid sunfish reach harvest size (200–400 g) in 12-15 months, about 30% faster than pure bluegill under the same conditions. FCR is 1.5-2.2 on commercial sunfish or catfish pellet (32-38% protein). The predominantly male sex ratio (90-95% male) means minimal reproductive interference with growth, and the few females in a cohort rarely produce viable offspring because hybrid fertility is reduced. This effectively eliminates the overpopulation problem that plagues tilapia and some other livebearer-type systems, without requiring hormonal sex reversal or manual sexing. Temperature range: 5–32°C, optimal at 24–28°C. Dissolved oxygen above 4 mg/L; ammonia below 1 mg/L. Stocking density: 10-20 g/L. Hybrid sunfish are legal in most US states and fingerlings are widely available from fish hatcheries, farm stores, and pond stocking suppliers across the Midwest and Southeast. They're hardy, disease-resistant, and tolerant of handling. The main limitation is harvest size: even the largest hybrids produce small individual fillets compared to tilapia, catfish, or bass. For personal consumption in a family-scale aquaponics system this is acceptable. For commercial sale, the yield per fish is too small to be competitive with larger species. Best suited for home aquaponics operators in temperate US climates who want a legal, easy-to-manage, self-limiting fish with excellent flesh quality and broad temperature tolerance.