Introduction
A seahorse is any of 46 species of small marine fish in the genus Hippocampus. " Hippocampus" comes from the Ancient Greek hippocampus, itself from hippos meaning "horse" and kampyos meaning "sea monster". Seahorses range in size from 1.5 to 35.5cm. They are named for their equine appearance, with bent necks and snouted heads and a distinctive trunk and tail. Although they are bony fish, they do not have scales, but rather thin skin stretched over a series of bony plates, which are arranged in rings their bodies. Each species has a distinct number of rings. The armor of bony plates also protects them against predators, and because of this outer skeleton, they no longer have ribs. Seahorses swim upright, propelling themselves using the dorsal fin, another characteristic not shared by their close pipefish relatives, which swim horizontally. Razorfish are the only other fish that swim vertically. The pectoral fins, located on either side of the head behind t...
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