Shark anal fins

There are several useful field guides to shark identification. Here we present an identification key to sharks found in waters around Atlantic Canada as outlined by Scott and Scott in their book Atlantic Fishes of Canada. Follow the question guide, click on the correct answer and use the diagram to help you with terms. With this key you can readily identify any of the 19 species of sharks that occur in the waters of Atlantic Canada. Below there is a series of links.

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Understanding Shark Fins

Shark anatomy begins with the skin. Yes, sharks are known for the menacing teeth in their mouths, but many do not even realize that their skin is made up of dermal denticles ; these are miniscule placoid scales that are similar to teeth. These dermal denticles are even covered in enamel, called vitro-dentine, and they also include dentine and a pulp cavity; they are extremely comparable with teeth. Unfortunately, people kill sharks for their unique skin to make shagreen, a type of sandpaper, and various leather products.
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Fins to the Left, Fins to the Right . . .

Two-dimensional velocity fields around a freely swimming freshwater black shark fish in longitudinal XZ plane and transverse YZ plane are measured using digital particle image velocimetry DPIV. By transferring momentum to the fluid, fishes generate thrust. These fins also act as roll and pitch stabilizers for the swimming fish. We used 2D PIV to visualize water flow pattern in the wake of the caudal, pectoral and anal fins of swimming fish at a speed of 0.
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When you think of a shark what distinctive features do you think of? Sharp teeth? A streamlined body? Distinctive fins?
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