Herrings consume copepods, arrow worms, pelagic amphipods, mysids, and krill in the pelagic zone. Unlike the amphipods, marine and freshwater isopods are entirely benthic. Among the marine crustaceans eaten are amphipods, crabs and krill. The krill can also catch and eat copepods, amphipods and other small zooplankton. The diet consists of mostly zooplankton which includes copepods, amphipods, and many other crustaceans. Caprellids are omnivorous, feeding on diatoms, detritus, protozoans, smaller amphipods, and crustacean larvae. It also eats some molluscs, marine worms, squid, and crustaceans such as amphipods. Other accidental or opportunistic consumption of copepods and amphipods have been documented. They also eat crustaceans such as shrimp, crabs, amphipods, stomatopods, and the larvae of decapods. In saline regions, there are abundant polychaete annelids, amphipods, and some mollusks such as clams. Chinook eat insects, amphipods, and other crustaceans while young, and primarily other fish when older. The invertebrate community consists of brittle stars, molluscs, amphipods and crabs. These fish feed on shrimps, crabs, fish, amphipods and mysids. Sexual cannibalism is common among insects, arachnids and amphipods. The most conspicuous aspect of the footage was the swarm of benthic amphipods.