The mantissa ratio of crucian carp and carp is 4: 5 = 12: 15, carp and silver carp are 15: 14, and crucian carp and silver carp are12:/kloc-0.

The mantissa of crucian carp is 12*30=360.

Carp mantissa 15*30=450.

The mantissa of silver carp is 14*30=420.