crustaceans (crabs, lobsters, horseshoe crabs)
They are scavengers, their planktonic larvae are a big food source.
No
It is an order of small crustaceans.
No - they are crustaceans
small fishes
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.
Wikipedia: Seahorses eat small shrimp, tiny fish, crustaceans and plankton.
Crustaceans, worms, small fish and small clams
yes
Crustaceans like lobsters and crabs are scavengers. They mostly eat scraps left behind from other fish and dead critters found on the bottom of the ocean.
maybe other small fish Mainly small mollusks and crustaceans.