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Anatomy. The head of a fish includes the snout, from the eye to the forward most point of the upper jaw, the operculum or gill cover (absent in sharks and jawless fish), and the cheek, which extends from eye to preopercle. The operculum and preopercle may or may not have spines.
The head of a fish includes the snout, from the eye to the forwardmost point of the upper jaw, the operculum or gill cover, and the cheek, which extends from eye to preopercle. The lower jaw defines a chin.
Gain familiarity with the basic regions of the vertebrate skull—neurocranium, splanchnocranium, dermatocranium. Identify the basic components of the shark chondrocranium. Identify the elements of the fish head listed below and recognize the skull region to which each element belongs.
Most fish have a structure called the lateral line that runs the length of the body—from just behind the head to the caudal peduncle (Fig. 4.31). The lateral line is used to help fishes sense vibrations in the water.
The body of a fish is divided into a head, trunk and tail, although the divisions between the three are not always externally visible. The skeleton, which forms the support structure inside the fish, is either made of cartilage (cartilaginous fish) or bone (bony fish).
10 Νοε 2019 · Fish anatomy includes the role of gills, fins, swim bladders, scales, and lateral lines. They are complex aquatic creatures.
Fish have a system of muscles for movement. Muscle contractions ripple through the body in waves from head to tail. The contractions whip the tail fin against the water to propel the fish through the water. Most fish have a swim bladder. This is a balloon-like internal organ that contains gas.
