Marine plankton and juvenile jellyfish Stock Image C055/8525

Mostly plankton just drift where currents take them, though some, like jellyfish, swim slowly but not fast enough to generally overcome the influence of currents. Plankton are a diverse group, which traditionally were divided into two trophic (feeding) groups: phytoplankton and zooplankton.. Jellyfish are slow swimmers, and most species form part of the plankton. Traditionally jellyfish have been viewed as trophic dead ends, minor players in the marine food web, gelatinous organisms with a body plan largely based on water that offers little nutritional value or interest for other organisms apart from a few specialised predators such as the ocean sunfish and the leatherback sea.

Jellyfish are significant consumers of plankton, feeding mostly on zooplankton using tentacles and/or oral arms containing stinging cells called nematocysts (Lucas and Dawson, 2014).. Jellyfish, often seen drifting gracefully in the ocean, are scientifically classified as plankton. This classification might surprise many, as these creatures are often perceived as larger, more complex organisms. Understanding this classification is crucial because it reshapes our view of marine life and the intricate web of the ocean's ecosystem.