Since watching a documentary on Salmon Sharks I've been calling my wife a little nickname. She thought it was cute. Probably told her friends too. Then she looked it up on the internet. Not good.
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"My little Copepod" huh?

Derived from a Greek word meaning one who eats at another's table or one who lives at another's expense, a parasite is usually a smaller organism that harms a larger organism known as a host. Individual parasites usually do not kill their hosts, rather they live in close association with them and feed on or rob nutrients from them. In this way they impose an energy tax on the host that affects its ability to survive. Good parasites do not typically overtax their hosts. And, by not doing so, they ensure their own continued survival.

Many types of parasites pester sharks, including various viruses, bacteria, protozoans, worms, crustaceans, and even fishes. Among the crab-like critters, a.k.a. the crustaceans, a group known as the copepods has been exceptionally successful.

Copepods account for about 32% of all crustaceans (some 10,000 of 31,000 described species). While most of them (about 75%) are free-living, approximately 15% (1,500 known species) are parasites of fishes. A group of copepods called the siphonostomes has been most successful at parasitizing fishes, including sharks. These copepods possess a relatively long mouth tube that typically contains two sinister-looking saw-toothed mandibles that are used while feeding.