Question: how much water to produce fish?
Answer: While statistics abound to quantify how much water is needed for various purposes (drinking water needs are 2-5 litres per person per day, household needs are 100-500 litres per person per day, to produce 1 kg of grain takes 300-3,000 litres and to produce 1 kg of beef 7,000-10,000 litres), no good estimates exist for ...