Is a sucker fish commensalism or a parasitism?

A sucker fish, often referred to as a remora, exhibits commensalism rather than parasitism. In this relationship, the remora attaches itself to larger marine animals, such as sharks or turtles, benefiting from transportation and access to food scraps without harming the host. The host remains largely unaffected by the presence of the remora, which is characteristic of commensal interactions.