This large family of fishes is widely distributed in the tropical and subtropical region of every continent except Australia. The distinction between these fishes and the true Carps is clearly indicated by both the scientific and the popular name of this family. Carps have pharyngeal teeth but a toothless mouth. The Cyprinodontidae have both oral and pharyngeal teeth. These fishes usually have a flattened head with an upturned mouth. No barbels or adipose fins occur. Some of the Cyprinodontidae are egglayers, others livebearers. In the latter the anal fin is modified to form an intromittent organ called the gonopodium. So varied are the aquatic needs and methods of reproduction in this family that broad generalizations are inadequate.It is essential to consider each genus, and at times each specics, separately. It should be noted that the distinction between the egg-laying and livebearing species is one of convenience. Taxonomically some of the livebearers are more closely allied to some egglaying forms than to other livebearers. Recommened feeding system Aquaze Tropical.
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