1. Parasitism (tough luck to one associate)
Parasites of sharks and batoids are mainly copepods (small crustaceans) and flatworms. The Greenland shark has a copepod which attaches itself to the cornea of the eye: Most of them have one copepod -- a whitish-yellow creature from 3 mm. to 3 inches i
2. Mutalism (everyone wins)
Several species of small fishes, notably the cleaner wrasse (Labroides dimidiatus), are "cleaners" that pick debris and parasites
from sharks.
Remora commonly attach themselves to sharks or ride their hydrodynamic bow wakes. In addition, they may eat parasites of sharks.
3. Commensilism (one wins and noone loses, )
Pilotfish (usually Naucrates ductor, but there are others) often travel with sharks, for unclear reasons. This relationship may be
due to the natural schooling behavior of pilottish, or the pilotfish may conserve energy by riding the hydrodynamic bow wake of the shark. Pilotfish also eat small amounts of food scraps released as the shark feeds.
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