Recognizing the significant role of marine plankton in the food chain, there is a growing awareness of the unreleased potential found at the base of the food chain. Several species of zooplankton differ in their nutritive value and thus the food conversion ratio to enrichment in essential fatty acids or proteins differs. Zooplankton form one of the most important candidates for ecological indicators. Zooplankton acts as an important link between the primary producers and organisms on higher trophic levels, including marine fish and marine mammals. A biochemical fingerprint has been demonstrated in zooplankton species. Zooplankton, such as copepods and krill, are the most numerous primary consumers of plankton in the marine environment. Diatom cultures are widely utilized for feeding shrimp larvae, zooplankton, juvenile oysters, and act as lipid sources, biofuel precursors, optical sensors in nanotechnology.