Bones or cartilage that surround the dorsal nerve cord and form the spine.
Skeleton elements that support the pharynx.
Ability to detect chemicals in the environment.
Organ that allows them to sense vibration in the water.
Fertilization that occurs outside the body of each parent.
Flexible, lightweight material made of cells surrounded by tough fibers of protein.
Small, toothlike spines that feel like sandpaper.
Fertilization that occurs inside the female's body.
Gas-filled sac that is used to control buoyancy.
Have fleshy fins that are supported by a series of bones.
Do not have fins with a central bony axis - they have fins that are supported by long, segmented, flexible bony elements called rays.
Hard plate that opens at the rear and covers and protects the gills.
Where water flows across the gill filaments in a direction opposite to blood flow.
Receives and processes information from the fish's visual, auditory, and lateral-line systems.