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Anal Fin Function

Because of the liver's capacity for detoxification and storage of harmful components, it is often used as an environmental biomarker. While on the ocean floor their paired fins are not used for any kind of movement.

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The primary structural framework upon which the fish's body is built; connects to the skull at the front of the fish and to the tail at the rear. The vertebral arch surrounds the spinal cord, and is of broadly similar form to that found in most other vertebrates. All graphs portray the same fish swimming at the five steady swimming speeds and during a maneuver. Specialised fins are used to control motion. As with most fish, the tails of sharks provide thrust, making speed and acceleration dependent on tail shape. Along the margin at the rear of their bodies is a line of small rayless, non-retractable fins, known as finlets.

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View Article Google Scholar 8. They are referred to as spines. Journal of Experimental Biology So the front Anterior portion of such a fin is called the Spiney Dorsal and the rear Posterior portion is called the Soft Dorsal.

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It is sensitive to pressure, vibration, movement and sound and lets the fish know what is in the water around them. Morphology and experimental hydrodynamics of fish fin control surfaces. In general, however, such male displays are thought to aid keeping the attack levels in intrasexual competition within limits, as the aggression level and health status of rivals may be judged upon these displays [52] , [53] , [54]. Kinematic variation is large during maneuvers.

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Most studies involving the locomotory function of fish fins have focused on paired fins Drucker and Jensen, ab ; Drucker and Lauder,the caudal fin Blake, a ; Lauder, ; Lauder et al. Taken together, our female mate choice experiments demonstrate that egg-spots in A. All tanks provided standardized conditions of constant water temperature of 26°C, pH 7, and a Scales protect the fish from its environment. They resemble primitive bone marrow in hagfish.

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