Crayfish Dissection12:29Life Science lab
Crayfish Dissection
Identify the cephalothorax and abdomen, then open the carapace carefully to examine the gills and internal organs. Complete the pre-lab and write-up.
Crayfish Dissection12:29Learning sequence
- PrepareRead the guide and complete your prelab.
- ObserveWatch the dissection. Follow your teacher's directions.
- RecordDraw, label, and describe your specimen on the write-up.
In This Lab You Will
Identify the crayfish as an arthropod and locate the cephalothorax and abdomen.
Examine external structures, including the carapace, appendages, and tail fan.
Determine sex using the swimmerets.
Open the branchial chamber and identify the gills.
Expose and identify major internal organs, then connect each structure to its function.
Complete the pre-lab and labeled drawings on the write-up.
Materials
Preserved crayfish; dissecting tray; dissecting scissors; blunt probe; forceps; gloves; eye protection; colored pencils; paper towels. Use only the tools and specimen provided.
Safety
Wear gloves and eye protection. Keep hands away from your face while working.
Use shallow cuts. Lift the carapace away from organs before advancing the scissors.
Use the blunt probe for teasing and separating tissue; do not rip the carapace away.
Keep fingers out of the cutting path. Report splashes, cuts, or damaged equipment.
Photos & Anatomy References
Select an image to enlarge it. Use these references alongside your specimen.
Photographs from the Mr. E Science crayfish dissection.