To determine which organisms are omnivores in a food web, we typically look for organisms that consume both plants (producers) and animals (consumers). In an ocean ecosystem, common examples of omnivores might include certain species of fish, marine mammals, and some invertebrates that eat both algae and smaller fish or crustaceans.
Since I don’t have the specific food web you are referring to, I cannot name the organisms directly. However, if you have a list of organisms from the food web, I can help you identify the omnivores based on the typical eating habits of marine species.
Feel free to share the list of organisms, and I will assist you in identifying which ones are omnivores!