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Its gills.
The rostrum is the part of the crayfish that is located between the eyes and the antenna. Rostrum is Latin for "beak" so the rostrum on the crayfish is considered its beak.
The gills- pretty sure
A rostrum on a crayfish is an extension of its shell. This part is used for extra protection.
They can eat it or sell them to make profits!!
its gills
3, go to this web page for a fantastic explanation: www.science.mcmaster.ca/.../CRAYFISH/CRAYFISH.HTM
The rostrum on a crayfish is a hard beak extending from the head that is used for protection.
Head: foremost part of a crayfish.Thorax: upper part of a crayfish's body.Abdomen: lower part of a crayfish's body.Exopodite: external part of the uropod.
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.
Decapod
in the left part of the thorax