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Photo by Marty Snyderman. What are the release dates for The Wonder Pets - 2006 Save the Ladybug? Specialists debate the number of definitions and ways that fish tails should be categorized or described, but it is safe to say that there are a variety of shapes found in the world of bony fishes and another handful in the cartilaginous fishes, the sharks, rays and skates. Most often, the fish body is fusiform, so it is fast-moving, but it can also be known as filiform (eel-shaped) or vermiform (worm-shaped). Yet only select families of fishnamely trouts and salmons and catfishespossess a small nub-like fin behind their dorsal fin and before their caudal (tail) fin. It runs in a semi line from the gills to the tail fin. Less drag is produced by an emarginated-shaped tail such as those possessed by schoolmaster snappers. The caudal peduncle is the narrow part of the fishes body to which the caudal or tail fin is attached. All chordates have a postanal tail at some point, but they may not have that tail for their entire lives. Eels provide classic examples of fishes with tail fins that are described as continuous, with the tail being hard connected to the body in such a way that it is difficult to say where the body stops and the tail starts. Sometimes they hover almost motionless for long periods but when they choose to do so, they move about in erratic bursts of speed by flexing their tails. A wooden box was constructed to house the clay tail as it was cast in REPRO, a solidifying molding mixture. What does contingent mean in real estate? Mailing Address It must be emphasized that the swimming movements are produced by the whole of the muscular body, and in only a few fish do the fins contribute any propulsive force. This design enables the tail to provide lift for these animals when they break the surface to breathe. Sharks gain their forward thrust from the lateral movement of their tails. This fin is called the adipose fin*, and while many fisheries biologist and fishermen know what it is, explanations have been few and far between when it comes to the function of the adipose fin. Most species of shrimps and lobsters can repeatedly flex their tails to cover a greater distance in a short period of time. An emarginated tail has a relatively broad surface but the surface is slightly indented in the center. For analysis, sequential tracings of the propulsive appendages were made from the 4139 N Mulberry Drive #B No matter how deep they can dive or how long they can remain underwater, eventually all marine mammals must return to the surface to fill their lungs with life-sustaining air. 3. In general, fish have the same vertebrate body as all vertebrates. The base of the caudal fin is known as caudal peduncle with strong swimming muscles. 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