The Structure Of Fish
All fish have an internal skeleton, a fishes skeleton is made up of a skull, backbone and fin support bones.
A fishes skull has a cranium and visceral arches. The cranium is a bony cover that protects the fishes brain, while the visceral arches support the gills of the fish. Visceral arches are also called “Gill Arches.”
the backbone of a fish is a system of bones, like a humans it protects the spinal cord. From the backbone tiny bones extent outward to form the fishes rib cage.
All fish have fins, though the number of fins on a fish varies from fish species, to fish species. Each fin on a fish is connected to a large supporting base. Most fish have two sets of paired fins - the pectoral fins, which are positioned on both sides of the fish, behind its head area. The other pair of fins - pelvic fins are usually positioned further back on the fish and are always on the belly side of a fish. Pelvic fins are smaller than pectoral fins. Some other common fins found on fish are the dorsal fin, which runs down the center of the back of a fish and the anal fin which can be found by the fishes anus.
