Remora

“The Remora, the sucking-fish, or sucker. By means of the suctorial disk, a transformation of the spinous dorsal fin, the species can attach themselves to any flat surface. The adhesion is so strong that the fish can be dislodged only with difficulty, unless pushed forward with a sliding motion. Being bad swimmers, they attach themselves to vessels, or to animals having greater power of locomotion than themselves; but they cannot be regarded as parasites, as they do not obtain their food at the expense of their host."—(Charles Leonard-Stuart, 1911)

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