Choosing the right aquatic species is one of the most important decisions when designing a productive and low-maintenance aquaponics system. Each species has its own nutritional needs, temperature preferences, and growth patterns that directly affect system stability and plant productivity.

This article explores three excellent aquaponics candidates—Yellow Perch, Walleye, and Prawns/Shrimp—including their ideal water parameters, advantages, and potential challenges.

1. Yellow Perch

Temperature range: 66–70°F (18–21°C)
 Time to reach 1 pound: ~12 months
 pH range: 6.5–8.5

Yellow perch are a small, fast-growing fish known for their mild flavor and attractive coloration. They are closely related to silver perch and are popular among hobby aquaponics users looking for a hardy, tasty species. Because yellow perch thrive in moderately warm water, they require careful temperature management to stay within their optimal range.

Advantages

• Highly flavorful—ideal if you plan on harvesting your fish
• Prefer shallow tanks, making it easier to monitor them
• Can be trained to eat pellets

Disadvantages

• Breeding demands dropping water temperature to 45°F for a month, which is unsuitable for plants
• Maintaining the ideal temperature is challenging, limiting their widespread use
• Cannibalistic tendencies—fish must be similar in size

2. Walleye

Temperature range: 65–75°F (18–24°C)
 Time to reach 1 pound: No verified data available
 pH range: 6–8

Walleye are valued by sport fishers and known for their forward-facing, reflective eyes, which help them hunt in dark or murky conditions. While wild walleye can reach up to 20 pounds, aquaponic-raised walleye typically grow 10–12 inches in 18 months and reach about 1 pound—perfect for harvesting.

These fish tolerate a wide pH range and are relatively hardy, but require stable temperatures for long-term success.

Advantages

• Low-maintenance; they need little light and feed intermittently
• Compatible with most plants thanks to their pH tolerance

Disadvantages

• Typically do not adapt well to commercial fish feed

3. Prawns & Shrimp

Temperature range: 57–84°F (14–29°C)
 Time to harvest: 3–6 months
 pH range: 6.5–8

Adding shrimp or prawns to an aquaponics system is a smart move for increasing profitability. These small crustaceans are in high demand and grow quickly, providing both nutritional benefits for plants and a valuable food source for people.

They are hardy when kept within the right pH range but sensitive to sudden temperature shifts, which makes consistent system control essential.

Advantages

• Delicious and marketable
• Require minimal maintenance
• Can be kept in sump tanks
• Fast growth cycle

Disadvantages

• Many fish species will readily eat them
• Vulnerable to diseases
• Can attack or cannibalize one another
• Sudden temperature changes can cause mass mortality

Final Thoughts

Yellow perch, walleye, and prawns/shrimp each offer unique benefits to aquaponics systems. Your choice should depend on your climate, tank design, intended crop types, and whether you’re focused on food production, system simplicity, or market value.

Choose prawns/shrimp for low-maintenance protein production and added system diversity.s.

Choose yellow perch if you want a tasty, manageable fish and can maintain stable temperatures.

Choose walleye for a hardy species that thrives in low-light conditions.