Question 1

What is the ideal tank-to-grow-bed ratio in aquaponics?

Accepted Answer

The standard ratio is 1:2 by volume — for every 1,000 L of fish tank, you need approximately 2 m² of grow bed (or equivalent grow bed volume). This ensures plants process enough fish waste to keep ammonia and nitrate levels safe for the fish.

Question 2

How many fish can I keep per litre of water?

Accepted Answer

For tilapia, a safe stocking density is 15–20 kg of fish per 1,000 L at light to moderate intensity. Goldfish can handle around 8–10 kg/1,000 L. Overstocking leads to ammonia spikes, oxygen depletion, and fish stress — always start at light density and increase gradually as the system matures.

Question 3

What pump flow rate do I need for an aquaponic system?

Accepted Answer

Aquaponic systems need to circulate the entire tank volume at least twice per hour. A 1,000 L tank needs a pump delivering at least 2,000 L/hr at the operating head height. This ensures adequate oxygenation for fish and moves fish waste to the grow beds efficiently.

Aquaponics Balance

Aquaponics Balance