You can mix them, but the proportion of Diao Zi Fish (Bleak) and Mandarin Fish should be smaller, because they are carnivorous fish. Also, larger fry should be used for crucian carp and yellow duck call (Pelteobagrus fulvidraco), otherwise they may be eaten.

Of course, it is possible to raise bleak and mandarin fish as the main species and put some crucian carp and yellow croaker (Pelteobagrus fulvidraco) as the set species, and after natural reproduction, the smaller ones are directly used as the natural bait for the first two.