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The streamlined body of the fish decreases the amount of friction from the water. A typical characteristic of many animals that utilize undulatory locomotion is that they have segmented muscles, or blocks of myomeres , running from their head to tails which are separated by connective tissue called myosepta.
The body is often fusiform, a streamlined body plan often found in fast-moving fish. Some species may be filiform ( eel -shaped) or vermiform ( worm -shaped). Fish are often either compressed ( laterally thin and tall) or depressed ( dorso-ventrally flattened).
Fish locomotion is the various types of animal locomotion used by fish, principally by swimming. This is achieved in different groups of fish by a variety of mechanisms of propulsion, most often by wave-like lateral flexions of the fish's body and tail in the water, and in various specialised fish by motions of the fins. The major forms of ...
Open water fish, like this Atlantic bluefin tuna, are usually streamlined for straightline speed, with a deeply forked tail and a smooth body shaped like a spindle tapered at both ends. Many reef fish, like this queen angelfish , have a body flattened like a pancake, with pectoral and pelvic fins that act with the flattened body to maximize ...
Fish with this body plan tend to have a more streamlined body, higher aspect ratios (long, narrow wings), and higher wing loading than fish with the biplane body plan, making these fish well adapted for higher flying speeds. Flying fish with a monoplane body plan demonstrate different launching behaviors from their biplane counterparts.
Their diet varies considerably as well: some may eat zooplankton; others may eat fish, squid, shellfish, and sea-grass; and a few may eat other mammals. In a process of convergent evolution, marine mammals such as dolphins and whales redeveloped their body plan to parallel the streamlined fusiform body plan of pelagic fish.
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In this case, the body is described as a blunt body. A streamlined body looks like a fish , Oropesa, etc. or an airfoil with small angle of attack, whereas a blunt body looks like a brick, a cylinder or an airfoil with high angle of attack. For a given frontal area and velocity, a streamlined body will have lower resistance than a blunt body.