are sardines invertebrates
Small Fish/Invertebrates. Small fish and invertebrates are a major food source for larger predators in the open ocean. Herrings and Sardines are examples of small fish that are integral in the pelagic zone food chain.mall Fish/Invertebrates. Small fish and invertebrates are a major food source for larger predators in the open ocean. Herrings and Sardines are examples of small fish that are integral in the pelagic zone food chain.