The maths are simple: for one juvenile left in the sea today we will have a new generation tomorrow. For example, a juvenile codfish reaches 10 cm, weights 5.4 grams and has no chance to reproduce. A mature codfish of 80 cm weights in average 3.6 kilos and produces 657 eggs. And if we let these new 657 juveniles grow up to maturity, we could fish in the end up to 2400 kilos of codfish. In other words, fishing juveniles is completely illogical.