Menhaden are omnivorous filter feeders, feeding by straining plankton and algae from water. For example, oysters consume underwater plankton and algae. They feed on plankton and small crustaceans. Their diets include small crustaceans, plankton, and algae. Younger juvenile jacks tend to feed on plankton and small invertebrates. Carnivores' diets consist of shrimp, plankton, or tiny crustaceans. These organisms migrate up into shallower water at dusk to feed on plankton. It typically feeds on small marine organisms, such as fish and plankton. Anabaena is a genus of filamentous cyanobacteria that exist as plankton. Many archaea grow as plankton in the oceans. The fertilized eggs develop into trochophore larvae, which live as plankton. Cholera bacteria have been found in shellfish and plankton. The result can be rich feeding grounds attractive to the plankton feeding forage fish. The whale shark is an active feeder, targeting concentrations of plankton or fish. Devil and manta rays filter plankton from the water.