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The ribbonfish are any lampriform in the family Trachipteridae. These pelagic fish are named for their slim, ribbon-like appearance. Ribbon fish possess all the characteristics of fish living at very great depths. Their fins especially, and the membrane connecting them, are of a very delicate and brittle structure. In young ribbonfish some of the fin-rays are prolonged in an extraordinary degree, and sometimes provided with appendages.
