Noun
pilot fish (plural pilot fish or pilot fishes)
A marine fish, Naucrates ductor, that often follows large vessels and sharks.
It's early 2008 when this systems support pilot fish starts getting reports that a special Y2K tool has stopped working -- and that turns out to be a big problem. Source: Internet
It's quite a few years back, and this consultant pilot fish is assigned to visit a customer with a history of intermittent and hard-to-pin-down issues. Source: Internet