Below is a photo of what a splash of seawater looks like under the microscope, magnified 25 times. You're looking at a group of plankton. Now, plankton is a catch-all term for a variety of animal and plant life. Plankton is defined by its size, and by the fact that they are unable to swim against ocean currents. Plankton includes:
Marine viruses (the femtoplankton), microscopic algae and bacteria, tiny worms and crustaceans, as well as the egg, juvenile and larval forms of larger animals and plants such as seaweeds, crabs, lobsters, fish and urchins. Because they drift with ocean currents, even large jellyfish are classed as plankton.
Plankton, both plant and animal in nature, are the bread-and-butter of the oceanic food chain. And there's plenty of it. So, the next time you're in the ocean, strap on your bib, open wide, and prepare to feast.Thanks for the link, Ida. Photo source: DailyMail