Dead fish. Crabs tend to be detritus eaters, so if it's a chunk of something organic, they will try to eat it. As for a living fish, if the crab can catch the fish, the crab will try to eat the fish.
sheephead fish
birds, fish and sea otters
seagulls, crabs, some fish, seastars
crustean eats dead fish or crabs and lobsters
Birds, some fish, ect...
The Great Blue Herons eats small fish, such as shrimps and crabs
It eats jellyfish, fish , crabs ,and plants.
oxygen (air) and water
The box jelly fish eats fish crabs and other animals and People.
crabs,worms,clams,small fish, and crustaceans
Crabs eat green seaweed Whelks eat red seaweed Small fish eat shrimps Shrimps eat plankton Animal plankton eats plant plankton Sea anemones eat plankton Shore crabs eat shrimps and small fish Crabs eat whelk Small fish eats sea anemones Seagulls eat small fish and crabs
It depends to what type of fish food.