It is best to use live earthworms.
Since crayfish like foods with strong fishy odors, live earthworms have a stronger, longer-lasting odor.
However, live earthworms are more difficult to dig up. If you need them in large quantities, you need to buy them.
Black earthworms are best. Compared with black earthworms and green earthworms, large coarse black earthworms have a stronger odor, but do not smell so bad, so they are more suitable for underground cages, while green earthworms have a lighter smell and are not attractive to fish, so black earthworms are better. It should be noted that the floor cage must be straightened. Once the first end is attached, the floor cage should fit flat without twisting. It must then be forcefully straightened until it reaches thebe extremity, so as to maximize. space. The floor cage is fully utilized, and the space inside the floor cage is also fully displayed.