Sardines eat zooplankton, which is also known as "animal plankton" and floats around within the sea. Zooplankton feeds on plankton, which is the plant organism that is at the bottom of the ocean food chain.Continue Reading
Sardines threaten the ocean ecosystem, however, due to their massive population growth reports the Daily Mail. The reason for the population growth is that overfishing has lessened the populations of predatory fish in the oceans including salmon, North Atlantic cod, tuna and swordfish in addition to sharks. These marine animals eat sardines, but with less of them swimming in the ocean the sardines are living longer and reproducing longer without any threats according to the Pacific Fishery Management Capitol.
Sardines are small fish that can live up to 13 years in the wild, though they tend to live approximately 5 years. Interestingly, sardines also perform a sardine run whenever the cool water current changes according to the National Geographic. During this run, the sardines are looking to travel hundreds of miles through the coast, and many predators come out of hiding to eat as much of the sardines as they can. It is a feeding celebration for predators because the sardines swim tightly and thickly packed in groups of thousands.Learn more about Fish
Fish eat animal plankton, which are known as zooplankton. Plant forms of plankton are called phytoplankton, which exist as food for zooplankton. The most common zooplankton are copepods. They are crustaceans about the size of a grain of rice, according to Oceanic Research Group.Full Answer >
Rainbow fish are omnivores that eat a variety of foods in the wild, including aquatic and terrestrial insects, insect larvae, crustaceans, phytoplankton, zooplankton and detritus. A suitable diet for the aquarium includes algae, vegetables, frozen and live mosquito larvae, Daphnia and bloodworm.Full Answer >
The American or yellow perch begins life by eating the zooplankton in the lake. These are tiny animals that float along the surface of the water. When the fish are mature, they eat animals found at the bottom of the lake, such as crabs, snails, isopods and insect larvae. When they are large enough, they eat other fish.Full Answer >
Bluefin tuna feed primarily on other fish, including herring, anchovies, sardines and mackerel, according to the Office of Protected Resources. Young bluefin tuna also eat some crustaceans. The bluefin tuna is the largest of the tuna species, and it is an important large predator in the Atlantic Ocean.Full Answer >