This can't be generalized. The number of the 7th, 8th and 9th dynasties depends on the length of your fish, the degree of thinness you salvage, and the influence of the weather on the fry.

Some people say that it is 3,000 fish/kg in the 7th Dynasty, and some people can do it, but according to the fry and tilapia salvaged this spring, a kg is also between 200-2,300 fish/kg. Each batch is different.