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What Eats Tuna Fish

What Eats Tuna Fish

Tuna are strong, fast predators that sit near the top of the ocean’s food chain. But even these powerful fish have natural predators in the wild. Understanding what eats tuna can give insights into marine ecosystems and food webs.

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Major Tuna Predators

Only a handful of ocean predators are capable of taking down large, healthy tuna. The main tuna predators are:

Orcas, sharks, and other tuna species pose the biggest natural threat to tuna. Meanwhile, humans have heavily exploited tuna populations through commercial fishing.

what eats tuna Orcas


Killer whales, or orcas, are the main predators of large tuna like bluefin and bigeye tuna. Orcas hunt in deadly pods and use teamwork to herd and overwhelm these fast swimmers.

No other marine mammal can consistently take down adult tuna. Orcas are big enough and smart enough to kill tuna at all life stages.

what eats tuna fish Sharks


Large species of sharks prey on tuna. These include:

  • Great white sharks
  • Tiger sharks
  • Bull sharks
  • Makos
  • Hammerheads

Sharks don’t have the endurance to chase down tuna over long distances. Instead, these ambush predators target young, old, or otherwise vulnerable tuna.

what eats tuna predators Other Tuna

Other Tuna

Big tuna species like bluefin will eat smaller tuna. Cannibalism is common, with large adults consuming juveniles of the same species.

Tuna also prey on each other between species. Yellowfin tuna may eat skipjack, for example. This inter-species predation can impact tuna populations and ecology.

What Eats Tuna Fish humans


Humans exploit tuna through commercial fishing fleets around the world. Some species like bluefin are severely depleted due to overfishing.

International management has attempted to limit catches. But illegal and unregulated tuna fishing persists, making humans perhaps the biggest current threat to global tuna stocks.

Tuna Predators Giant Squid

Giant Squid

As giant squid populations grow, they may increasingly prey on large tuna. Squid are formidable creatures with hooks and suckers for capturing prey. However, they have not yet been observed attacking full-grown tuna.

Young Tuna Predators

Young tuna face the highest predation rates from a wide range of ocean animals. What eats small and juvenile tuna?


  • Barracudas
  • Marlin
  • Swordfish
  • Cod
  • Groupers
  • Snappers

Small bony fish often specialize in eating the eggs and larvae of tuna. They take advantage of weak swimmers that cannot yet escape.

Some large predatory fish also prey on juvenile tuna once they are more developed. These predators are faster than young tuna and overpower them.

Tuna Predators Marine Mammals
Tuna Predators Marine Mammals

Marine Mammals

  • Dolphins
  • Porpoises
  • Seals

Schools of dolphins and porpoises corral and herd juveniles. Seals attack younger tuna near reefs and shores. These intelligent marine mammals are skilled hunters.


  • Requiem sharks
  • Threshers
  • Cookiecutter sharks

Smaller shark species prey on larvae and young tuna. Their jaws and teeth are designed to handle smaller soft-bodied fish.

Predators of Tuna fish Sea Birds
Predators of Tuna fish Sea Birds

Sea Birds

  • Cormorants
  • Pelicans
  • Gannets
  • Skuas
  • Terns

Seabirds dive from the air or swim underwater to snatch up bits of tuna flesh. Large aggregations can drive tuna into a bait ball and pick them off.

Other Predators

  • Squid
  • Octopuses
  • Sea turtles
  • Jellyfish

These ambush predators consume tuna eggs and larvae. Jellyfish can swarm thickly, eating huge numbers of juvenile tuna.

Tuna Predation Through Life Stages

Tuna face the highest predation rates right after hatching, with many larvae eaten by jellyfish and other zooplankton. Those that survive grow quickly, reducing predation over time.

Life StagePredators
EggsSmall fish, octopuses, squid, jellyfish
LarvaeFish, birds, dolphins, sharks, jellyfish
JuvenilesLarge fish, sharks, marine mammals, squid
AdultsOrcas, sharks, humans, giant squid

Eventually, tuna reach a size where few predators can threaten them. Their powerful swimming and schooling behavior also deter potential predators throughout life.

Predator Populations Shape Tuna Stocks

The populations of tuna predators influence the abundance of tuna species. More predators means higher mortality rates for tuna.

For example, recovering giant squid populations could increase predation pressure on tuna. Meanwhile, declining shark numbers due to overfishing likely benefit tuna stocks.

Monitoring key tuna predators gives insight into food web dynamics. This aids fisheries management and conservation efforts.


Tuna occupy an important niche in ocean environments as fast predators near the top of the food chain. But a wide array of marine animals prey on tuna, especially in early life stages.

Understanding tuna’s role as prey reveals important details about marine ecosystems. The populations of predators and prey ebb and flow in complex balances.

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Steve Momot

Steve is an accomplished professional photographer and marketer who specializes in the Fishing, Yacht, and Boating industry. With a strong presence as an influencer and marketing expert in the Marine Industry, he has made a significant impact in the field. Additionally, Steve is the original creator and co-founder of Sportfishtrader. Prior to his career as a marine photographer, he gained extensive experience as a licensed boat and car dealer in South Florida.

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