Walleye

Quick facts

Adult size

50 cm, 1500 g typical harvest weight

Days to harvest

730 to 1095 days from fingerling

Lifespan (max)

up to 29 years

Diet

carnivore

Temperature class

cool-water

Difficulty

advanced

Water parameters

Temperature range

4–24°C (optimum 20°C)

pH

6.5 to 8.5

Hardness

5 to 25 dGH

Minimum tank

800 L per individual at harvest size

Feed and growth

Feed protein

42% target

Daily feed (warm water)

1.10% of body weight per day

Daily feed (cool water)

0.60% of body weight per day

Max stocking density

30 g per litre of system water

A 1500g adult eats about 16.5 g of feed per day at optimum temperature. For a roster of 10 fish at adult size, that's around 165 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 lakes and rivers across central and eastern North America, from the Great Lakes and Hudson Bay drainage south through the Ohio and upper Mississippi basins. The species (Sander vitreus) is the most prized freshwater sport and food fish across the northern US and Canada. Wild walleye inhabit cool, clear to moderately turbid water over sand, gravel, or rock substrates. Adults reach 75 cm and 5–8 kg; exceptional specimens exceed 10 kg. The flesh is white, firm, lean, and delicately flavored, consistently ranked as the best-tasting freshwater fish in North America. Walleye support massive recreational fisheries worth billions in economic activity across the Great Lakes states and Canada. Commercial aquaculture of walleye is growing but remains small compared to catfish or trout.

Climate and outdoor ponds

Climate classification

temperate (handles seasonal swings)

Outdoor pond zones (USDA)

3 to 8 (winter low around -40°C or warmer)

Heating in a temperate climate

Not required (handles seasonal cool periods)

Cooling in a temperate climate

Required if your summer water temperatures exceed the upper tolerance

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 premium cool-water food fish for aquaponics, directly analogous to pikeperch (zander) in European systems. Optimal temperature is 18–22°C, with tolerance from 5–28°C. Growth in intensive culture: 300–700 g in 18-24 months on high-protein pellet (42-48% protein). FCR is 1.5-2.0 for pellet-trained fish. Walleye are the most challenging commonly cultured percid: feed training is difficult (many fingerlings refuse pellets and must eat live food), stress-related mortality during handling and transfer is high, and cannibalism in early life stages causes severe losses. Source pellet-trained fingerlings from specialized walleye hatcheries; expect to pay a premium. Stocking density: 10-20 g/L, lower than more tolerant species. Dissolved oxygen above 5 mg/L; ammonia below 0.5 mg/L. Low light is preferred; walleye have sensitive eyes and perform poorly under bright overhead lighting. Dim or shaded tanks improve feed intake and reduce stress. Fingerlings are available from state hatcheries and private walleye producers, primarily in the Great Lakes region and Upper Midwest. The market value ($15-25/kg retail) justifies the higher production difficulty for operators who can manage the species successfully.

Further reading

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