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However, there was little evidence of a lateral fold-to-fin transition in the fossil record. Retrieved 18 October Like scombroids and other billfish , they streamline themselves by retracting their dorsal fins into a groove in their body when they swim. Annual Review of Fluid Mechanics. The ancestral abdominal position is seen in for example the minnows ; the thoracic position in sunfish ; and the jugular position, when the pelvics are anterior to the pectoral fins, as seen in the burbot. Archived from the original PDF on Dorsal fins are located on the back.
Freshwater Fish ID Guide
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Fish fin - Wikipedia
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Fish anatomy
The bones that support the dorsal fin are called Pterygiophore. Triggerfish squeeze into coral crevices to avoid predators, and lock themselves in place with the first spine of their dorsal fin [48]. The ancestral abdominal position is seen in for example the minnows ; the thoracic position in sunfish ; and the jugular position, when the pelvics are anterior to the pectoral fins, as seen in the burbot. Some important functions of fins are described below:.
Published: 16.11.2015 в 18:00
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