How many fish fit in a transport box?

My transport boxes have the dimensions 48 x 43 x 35 cm and weigh 15 kg.

A box can only be filled with the following quantities:

48 fish of 5-6 cm (shipping weight 0.3125 kg / fish)

32 fish of 6.5-7.5 cm (shipping weight 0.4688 kg / fish)

20 fish of 8-9 cm (shipping weight 0.75 kg / fish)

12 fish from 9.5 - 12 cm (shipping weight 1.25 kg / fish)

8 fish from 12.5 - 15 cm (shipping weight 1.875 kg / fish)

4 fish from 15.5 cm (shipping weight 3.75 kg / fish)

2 pairs (shipping weight 7.5 kg / pair)

The estimated shipping costs can only be used if the basket is not empty.