Congiopodidae is a family of scorpaeniform fishes native to the southern hemisphere, commonly known as pigfishes, horsefishes and racehorses. Congiopids live on the bottom of shallow temperate and sub-Antarctic seas, at depths of up to 600 metres (2,000 ft). They lack scales, and have a projecting snout with a small mouth.The alert pigfish, Alertichthys blacki, is a pigfish, the only species in the genus Alertichthys, found around New Zealand at depths between 100 and 600 m. It is between 15 and 20 cm in length. The Common Sea horse is often, but not always, yellow in color. As with other members of this group, it is an expert at camouflage, changing its color to blend in with the surroundings. This makes it difficult to distinguish between different species with certainty. All sea horses lack a caudal fin, which is replaced instead by a prehensile tail. This allows the fish to anchor themselves to items such as seaweed fronds. Sea horses can be incorporated as part of a reef aquarium, and kept in the company of other very gentle fish. Their propulsive power is provided by the dorsal fin.
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