Five years. The life span of the black claw in Northeast China is short, and the longest life span is 5 years. There are about 400 species in 5 families of crayfish, mainly living in fresh water. Northeast black lobster, commonly known as Changbai Mountain lobster, grass lobster, water slug, slug clip, slug clip, has strong local characteristics. The black crayfish in Northeast China are mostly brown, reddish brown, grayish blue or olive green.