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.Know More
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 in Fish
Herring eat only plankton, which are tiny plant and animal species in the ocean. Plankton come in many varieties, ranging from tiny arrow worms to algae. In order to feed, herring swim through water with their mouths open, filtering the plankton out of the water. They generally spend most of the daytime in the deep waters, rising to the surface to feed at night when predators are less active.Full Answer >
While the specific diet of a freshwater fish depends on its species, most eat smaller fish, leeches, worms, insects, crustaceans, plankton and krill. When kept in an aquarium, freshwater fish can thrive on a combination of fortified flake food, pellets, sticks and wafers.Full Answer >
Mullets are a saltwater bottom feeder and prefer a diet consisting of vegetation, algae and plankton. Mullets often take on the "flavor" of the waters they feed in, which means polluted waters can make mullet unsavory to eat.Full Answer >
Walleye are piscivores (i.e. fish-eaters) and usually feed on any species of fish that they can catch and swallow, states the University of Minnesota website. They commonly eat yellow perch and various species of minnows and darters. Larval and young walleye eat waterfleas, copepods, small insect larvae and larval fish.Full Answer >