In the seashore food chain is herring gull predator to a crab?

Yes, herring gulls are predators to crabs in the seashore food chain. Herring gulls are omnivorous birds that feed on a variety of food items, including fish, small rodents, insects, and invertebrates. Crabs are one of the many invertebrates that herring gulls prey upon. Herring gulls will often search for crabs along the shoreline, or in shallow waters, and use their strong beaks to break open the crab's shell and consume the soft tissue inside.