Lidewij and I made a very simple calculation yesterday:
Rule of thumb: 500 gr fish per 20 - 40 liters
Tower: 500 liters
That means: 6 - 12 kg fish per system
Currently: 350 fish per system
1 fish around 50 gr?? > we should weigh one
350 x 50 = 17,5 kg
During the workshop we took around 20 fish per system to the new one, that makes 330 x 50 = 16,5 kg.
Michel the catfish farmer said there was an optimal stocking density. Too much or not enough and they would become cannibalists.
Maybe we should take out some more.
I'm not a great calculator, so do you agree?