crustaceans (crabs, lobsters, horseshoe crabs)
They are scavengers, their planktonic larvae are a big food source.
The sandbar shark is a carnivore, feeding primarily on small fish, crustaceans, and squid. They are not considered herbivores, omnivores, or scavengers.
No
It is an order of small crustaceans.
Scuds are omnivorous, feeding on detritus and algae as well as preying on small invertebrates. These freshwater crustaceans play an important role in aquatic ecosystems as both scavengers and predators.
Freshwater sturgeons are not predators; they are mainly scavengers or bottom feeders that feed on small invertebrates, crustaceans, and insect larvae. They are more commonly prey for larger predators like sharks, seals, and humans.
small fishes
No - they are crustaceans
These animals are predators, and they eat all types of plankton and also fish, that they catch near or upon the bottom of the ocean or rivers.
Grenadier fish are deep-sea scavengers that primarily feed on small fish, crustaceans, and other bottom-dwelling creatures. They are opportunistic feeders and may also consume detritus and carrion found on the ocean floor.
Wikipedia: Seahorses eat small shrimp, tiny fish, crustaceans and plankton.