| | Conditions & Treatments | Bones, Joints & Muscles How many vertebrae are in a fish spine? Fish do not have vertebrae. They have a notochord, which is a flexible, rod-like structure that runs along the back of the fish and provides support. Bones, Joints & Muscles - Related Articles Relief for Tendonitis Can You Use Epsom Salt on a Swollen Finger? What are all of the skeletal muscles in body? Why do you have a tailbone? How much pressure or force does it take to crush a hyoid bone? How to Cup a Wrist How to Repair Trigger Thumb