Da blue crayfish, that is, blue devil shrimp, belongs to the freshwater lobster class, because of the blue freshwater crayfish there are many kinds of freshwater crayfish, and there are many kinds of freshwater crayfish itself is not the natural color of the blue body, but can produce pure blue mutant varieties, therefore, leading to today's "Blue Devil Shrimp" the concept of this term is quite vague.
Lobster diet is more mixed, you can eat fresh grass roots, humus, aquatic plankton and artificial feed, only by fertilizing the water and regularly sinking some fresh grass into the water or planting part of the water plants can be, although low-oxygen, but when the water body of dissolved oxygen reaches more than 4 mg / l, more conducive to improving the growth rate.
Blue devil shrimp mostly from the United States, Florida, western Australia, without tentacles body length of about 15 to 20 centimeters, with tentacles body length, the maximum length of 40 centimeters. Blue Devil Shrimp have two kinds of purple and blue, red and black.