Nephridiopores in crayfish are part of their excretory system (for removing nitrogenous waste); crayfish propel water from the rear to the front and out the nephridiopores. It is analogous to how humans have to expend their liquid waste.
Crayfish
The primary excretory product of crayfish is that of a small amount of ink. Due to evolution present day crayfish no longer possess a large ink bladder. This is due to the shallow water they reside in and the extra weight the bladder would have put on the animal.
My older crayfish died and my littler crayfish has not yet how do/can they die?
Crayfish are known as both crayfish and yabbies in Australia. "Yabbies" are freshwater crayfish, often found in rivers, creeks and dams in rural areas.
excretory
protects the crayfish
Crayfish are omnivores.
Do crayfish have tarritoris
The excretory system removes liquid wastes.
Crayfish are related to small lobsters. Here is a link for pictures of crayfish. http://mackers.com/crayfish/pics.htm
The urine is part of the excretory system.