shellfish carnivores

Is Shellfish An Omnivore? The diet of a crab includes shellfish such as mussels and oysters. Considered an omnivore, they will also eat snails, worms, fish, fungi, bacteria and anything else they can find. Is shellfish a herbivore? Inter-tidal herbivorous shellfish such as mussels and clams can help people reach a healthy balance of omega-3