Do Swordfish Eat Squid? What Else They Eat?

Yes, there is evidence that swordfish eat squid. In fact, squid is one of the swordfish’s primary food sources. Vitamins, minerals, and proteins found in squid make it an excellent food source for swordfish. Also, squid contains taurine, an essential amino acid for heart and eye health.

A swordfish typically uses its long, sharp bill to impale its prey. When hunting for squid, swordfish use their keen vision to identify schools of squid. Then, they attack the squid with their bill after chasing them with their tails.

Throughout this blog, I’ll investigate how and why they do so. I will also explore the scientific research that has been conducted on swordfish feeding habits.

So, let’s discover what life is like for these amazing creatures in the ocean!

Why Do Swordfish Eat Squid?

sword fish

Well, for many years, marine biologists and fishermen have debated this topic! Some experts believe that swordfish consume squid, while others argue that they prefer other types of prey. Now, let’s find out why swordfish eat squid.

Provide Energy

Swordfish need high protein diets to support their active lifestyle and large body size. Due to its high protein, vitamin, and mineral content, squid effectively satisfies these needs.

Note: Squid’s high-energy content aids swordfish in maintaining their active lifestyle and migratory patterns.

Easy to Catch

Swordfish are fast swimmers, reaching up to 50-60 miles per hour. Their speed and strength make them efficient hunters of quick-moving, evasive prey such as squid.


Squid are found in plentiful supply in the oceans worldwide. This abundance makes them a readily available food source for energy-conscious swordfish.

Found in Aggregations

Squid often gather in large schools or aggregations, which increases their vulnerability to predation. Swordfish take advantage of these aggregations, as they provide a concentrated source of prey.

Swordfish swim vertically through a squid school, slashing their swords from side to side and capturing multiple individuals in a single pass. ~ Source

Size Advantage and hunting strategy

Swordfish, with their robust bodies and sharp bills, are capable of capturing and consuming a wide range of squid sizes. This versatility allows them to exploit different squid species and sizes as they encounter them in their habitat.

Deep Diving Capabilities

Swordfish are also capable of diving to great depths, where squid often reside. According to Science, they have a special organ in their head known as a “brain heater,” which allows them to tolerate the cold temperatures of the deep sea, enabling them to hunt squid that other predators may not be able to reach.

What Kind of Squid Do Swordfish Eat?

Swordfish are known to eat a variety of squid species. But their preferences may vary depending on their geographical location and available prey.

Swordfish commonly consume the following squid species:

Squid Species  Common NameScientific NameLocation
European flying squidBlue SquidTodarodes sagittatus 
Pacific flying squidNeon flying squidOmmastrephes bartramiiPacific ocean
Jumbo squidHumboldt squidDosidicus gigasEastern Pacific ocean
Short-finned squidMarket squidDoryteuthis opalescensNorth Atlantic
Long-finned squidNorthern shortfin squidIllex illecebrosusNorth Atlantic

How Do Swordfish Hunt Squid?

Here is a step-by-step process of how swordfish hunt squid:

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Step- 1: Swordfish use their excellent visual abilities to detect squid’s bioluminescence deep in the ocean.

Step- 2: Once a swordfish has located a squid, it will approach it rapidly. Then swimming at high speeds of up to 60 miles per hour.

Step- 3: As the swordfish approaches the squid, it will raise its long, sharp bill. Then slash it quickly, stunning the squid.

Step- 4: The swordfish will then turn around. It will impale the stunned squid during that time, making eating easier.

Step- 5: Swordfish may also use their powerful tails to stun and injure their prey before consuming it.

Step- 6: The swordfish will shake its head vigorously after impaling the squid. It helps to break off pieces of the squid, which it then consumes.

Step- 7: Swordfish are also known to hunt in groups or schools to increase their chances of catching prey.

When Do Swordfish Eat Squid?

sword fish

Here are some details about when and where swordfish are likely to eat squid:

The time of day

Swordfish are known to be active feeders at night. They are most likely to hunt for squid during the evening and early morning hours.


They are found in warm and temperate waters around the world. Their feeding patterns can vary depending on the region. In general, squid are more abundant in the summer months. As a result, swordfish are more likely to feed on them during this time.


Swordfish are known to be opportunistic feeders. So they will hunt for squid whenever they have the chance. However, squid are more likely to be active and abundant during calm weather conditions. as rough seas can disrupt their movement and make them harder to catch.

Where Do Swordfish Find Their Hunts?

Swordfish inhabit the open ocean, and they are known to hunt for prey in the epipelagic (sunlit) and mesopelagic (twilight) zones. In fact, they are highly migratory. Ocean currents, water temperature, and food availability influence their movements.

Moreover, they are capable of traveling long distances in search of prey. However, most of their food is near the surface, but they can dive deep if necessary. In cooler waters, swordfish regularly hunt at greater depths in the warm months.

Even so, they feed near the surface at night and in deeper waters during the day. Especially in warmer months when the surface water temperature is higher. Besides, they can dive to depths of up to 2,100 feet (640 meters).

Also, they can tolerate a wide range of water temperatures, which allows them to hunt in different areas of the ocean. The swordfish has a unique thermoregulation system that keeps its body temperature warmer than the surrounding water.

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In fact, it gives them an advantage in deeper and colder waters. Their well-developed eyes enable them to spot prey far away in low light conditions.

Do Swordfish Eat Fish? Kind of Fish Do They Eat

Yes, swordfish are carnivorous and primarily feed on a variety of fish!

Even so, their main diet consists of pelagic species such as mackerel, herring, and sardines. Furthermore, they consume predatory fish like barracuda and tuna.

The species is also known to feed on cephalopods, including octopuses and squid. Swordfish are opportunistic feeders. Their diet is quite diverse because they consume anything large and nutritious that is available.

Do Swordfish Eat Tuna? 

Tuna Fish

Swordfish do not typically eat tuna. Though swordfish do consume tuna on occasion, it is not a common occurrence.

Actually, swordfish and tuna are both large predatory fish found in the open ocean. According to our previous discussion, swordfish feed primarily on different types of fish. Meanwhile, tuna eat a variety of fish, squid, and crustaceans.

So, both species can be caught in the same fishing grounds, but they generally do not prey on each other. However, juvenile tuna can be on the swordfish menu, especially if found in the same vicinity.

Do Swordfish Eat Octopus?


The answer is yes. Swordfish are known to eat octopuses. In fact, octopus is a common prey item for swordfish and other fish species.

Usually, octopus is often found in the same areas as swordfish. Even the diet of swordfish may vary depending on the availability of prey and their location. However, further research is needed to determine if swordfish consume octopus regularly.

Do Swordfish Eat Shrimp?

Yes, swordfish will eat shrimp as part of their diet. Especially if they are found in the same geographical area as the swordfish.


Shrimp are a common prey item for many predatory fish, including swordfish. Also, they can be a valuable source of nutrition for these animals. However, some scientists believe that swordfish might actually be better at digesting shrimp than other fish.

Do Swordfish Eat Carbs?

A swordfish’s diet does not contain carbohydrates, as do most fish. Instead, they obtain their energy primarily from protein and fat. Indirectly, swordfish may consume small amounts of carbohydrates when they eat prey containing carbohydrates. This includes crustaceans and small fish that have consumed plant matter.

Do Swordfish Eat Other Swordfish?

Swordfish are generally not cannibalistic. So, there is no evidence to suggest that they commonly eat other swordfish as part of their diet.

In fact, adult swordfish are more likely to be solitary creatures. By doing so, they reduce the likelihood of encountering other swordfish. In rare cases, swordfish stomachs or intestines have been found with the remains of other swordfish.

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Do Swordfish Eat Humans?

It is not true that swordfish eat humans. Actually, there are no known instances of swordfish eating humans. The swordfish typically lives in open oceanic waters and avoids human-populated areas.

However, it is essential to note that swordfish are wild animals. As a result, they can be dangerous if not handled correctly. When interacting with wild animals, it’s always wise to exercise caution. Also, make sure you follow proper safety procedures.

Is There Any Fish That Swordfish Avoid Eating?

There is no evidence that swordfish actively avoid eating any specific fish based on their feeding habits. But generally, they are known to avoid fish with tough scales or spines.

Because fish with tough scales or spines can be difficult for swordfish to swallow. They may even cause injury to their digestive system, so they tend to avoid these types of prey. Instead, swordfish typically prey on smaller, more easily digestible fish.

How Often Do Swordfish Eat?

The frequency of their feeding may vary depending on factors. During periods of warmer water temperatures, swordfish may feed more frequently. On the other hand, during colder temperatures, they may feed less.

Additionally, swordfish are known to be active hunters that can swim at high speeds, allowing them to catch their prey efficiently. They may not need to feed as frequently as other fish species. Furthermore, if necessary, they can survive without food for several days.

How Much Do Swordfish Typically Eat Daily?

The amount of food a swordfish eats daily depends on various factors. Based on research, adult swordfish have been observed to consume between 2% and 5% of their body weight per day.

sword fish

So, for example, a 500-pound swordfish might eat anywhere from 10 to 25 pounds of food daily. However, it’s worth noting that swordfish can go several weeks without food. So their feeding habits can vary depending on environmental conditions and prey availability.


1. Is there any danger for swordfish of eating squid?

There’s not a significant danger to swordfish when eating squid. However, squids have hard beaks that could potentially injure a swordfish if swallowed in the wrong way. Plus, some larger squid species can put up a substantial fight.

2. Do baby swordfish eat squid?

No, baby swordfish feed on zooplankton and small crustaceans. As they grow and mature, their diet expands to include larger prey like squid.

3. Do swordfish eat giant squid?

No, swordfish do not eat giant squid. Giant squid are quite large, often growing up to 43 feet. In contrast, swordfish typically grow up to 9.8 feet. The size difference makes it unlikely for a swordfish to prey on a giant squid.


Swordfish are known to feed on various prey, including squid. Their sharp bill and powerful swimming abilities make them formidable predators in the ocean.

There is still much to learn about the feeding habits of these magnificent creatures. Although it is obvious that squid are an essential component of the swordfish’s diet, they also play a crucial part in their survival.

Further research may help us better understand this fascinating predator.

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