The food chain underwater is interesting and diverse. It has many different "tiers" that start from the sun to the Orcas and the Great White Shark. Note that while the sun is not listed it is completely needed for life to flourish.
Red = eaten by.
Green = eats
Tier 6: Plankton. The base of the food chain, plankton aren't just herbivores. Their are carnivorous plankton that interestingly eat herbivorous plankton.
Zooplankton:
Carnivorous plankton
Herbivorous plankton
Krill
Whales(Sperm whales, humpbacks, etc)
Herbivorous plankton:
Krill
Whales(Sperm whales, humpbacks, etc)
Carnivorous plankton
Zooplankton
Carnivorous plankton:
Krill.
Whales(Sperm whales, humpbacks, etc)
Herbivorous plankton.
Zooplankton.
Tier 5: Krill, shrimp, crayfish, etc and small fish. These are small creatures that are eaten by bigger fish and whales.
Krill:
Whales(Sperm whales, humpbacks, etc)
Some fishes
All forms of plankton
Shrimp, crayfish, etc
Many forms of fish that are bigger
Small fish, debris
Small fish:
Whales(Sperm whales, humpbacks, etc)
Bigger fish
Small scraps of food
Fish poop(Only for some)
Debris
Tier 4: Bigger fish and squid. Big fish and squid that are eaten by sharks and eat small fish.
Squid:
Sharks
Whales(the bigger kind of squid are eaten by whales)
Fish(Mainly Squid but some bigger fish also do the same)
Bigger fish:
Sharks, Orcas, Dolphins and sea lions, seals and the like
Small fish, shrimp, crayfish
Tier 3: Dolphins, Sea lions and seals and Whales. As big as some of these creatures get, they are still preyed on others and humans have been known to cast nets that injure and kill whales. Dolphins are extremely smart and can be trained to do tricks.
Dolphins
Sharks
Fish
Some squid
Sea Lions and seals
Orcas and sharks
Fish(but some namely the leopard seal are dangerous and eat a variety of things)
Whales:
Orcas and sharks
Krill
Small fish
Crayfish(some of the time)
Plankton
Tier 2: Sharks. It may seem like the food chain ends here but it goes on further yet. These animals are preyed on some of the time by the top predator.
Orca
Fish
Sea lions and seals
Squid
Tier 1: The Orca Whale. Preyed on by nothing and with its only threat as pollution and climate change from humans, the food chain ends here.
Fish
Seals and sea lions
Sharks
Food chains are significant and interesting. They can reveal what impact humans can have on the ocean and life itself. The ocean food chain is damaged by humans via climate change and pollution, the food chain can be disrupted and if one of the members of the food chain dies out or is in critical danger it affects the entire food chain.
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