The Ultimate Guide To Choosing The Best Spearfishing Knife + Reviews

Learn the things you should know when choosing the best spearfishing knife for you.

In today’s article, we will give you our opinion on a part of the diving equipment, that may in some cases be even more important than the speargun itself.

Why purchase a spearfishing knife?

Well, there are quite a few things to consider as reasons to use a knife when you go spearfishing.

Most spearfishers use a knife all the time. Mostly to cut fishing lines and subdue their catch. Most of the times you shoot a fish, just one shot won’t be enough to kill it immediately, unless you have a sharp aim and spear it through the brain.

Once you’ve successfully hit a fish, you would want to spike it through the the brain, which is located slightly behind its eyes, quickly. Most hunters tend to have respect for the creatures they eat, so spearfishers usually don’t leave their pray to die slowly and painfully.

Spiking the fish through its brain is the most humane way to kill it and end its unnecessary suffering.

If you don’t do that immediately, you might put yourself in danger, depending on your fishing spot.

A great deal of the dive spots, that are best for spearfishing, are known to be populated by sharks or other natural predators. Which is expected, as a good spearfishing dive spot would be home to a large variety of different species of fish and natural predators need need to eat a lot of fish to sustain themselves.

Picture this – you spear a fish and it starts to panic and wobble around, desperately trying to get away. The rapid movement of the fish creates sounds and vibrations under the water. They say a shark can smell a drop of blood from miles away, but they can detect those sounds from even greater distances.

The sounds of the fish that is struggling may certainly alert and attract natural predators.

And while that is surely the most natural train of thought, there are other occurrences, where a knife can literally save a life.

Diving is not safe, and as we are not creatures of the sea, it would be a good idea to carry a knife, just in case.

In the ocean you might accidentally trap yourself by entangling in fishing nets or lines. In a situation like this you must use a knife to cut the net or line to free yourself and avoid running out of oxygen and drowning.

So even if you don’t intent on using a knife, make sure you have one with yourself, just in case you have to save yourself or a diver friend.

Other situations that may require a knife are for example, entangled sea creatures that have mistakenly been caught in a fishing net.

You’re in for the kill on big fish, but you might save a dolphin’s life. After all, as a diver that literally gets their food from the sea, you should respect the biocenosis of your hunting environment, and take the chance to save a creature’s life, if you have it.

Now before you get into ordering a spearfishing knife, there are a couple of things to look at beforehand, as purchasing the right knife is of great importance.

Consider the following:

Blade material

Generally, when it comes to spearfishing knives, you will find two types of blades:

  • Titanium blades
  • Stainless steel blades

Titanium blades are the most popular spearfishing knives, used by divers. These knives are top-rated when it comes to the ratio of Toughness : Weight : Maintenance. What this means is that by purchasing a titanium blade knife, you will basically get your bang for the buck- A tough, light knife that requires low maintenance. If you’re looking for durable blades, the best spearfishing knife for you would be made of titanium.

Stainless steel knives on the other hand, require more maintenance, compared to the titanium blades. Even though they are “stainless” they do corrode as time goes by and that is why regular maintenance is recommended.

The maintenance, which will delay corrosion includes washing the knife with fresh water after diving, as well as polishing it with oil every now and then.

That is to say that titanium blades are way more efficient than stainless steel ones, but, more expensive as well.

Any of the two can be your go-to knife, depending on the make.

Knife size

If you ask expert spearos, they will recommend you small-to-medium sized knives, as bigger ones may cause discomfort and will certainly be a bigger investment.

Small knives– 2-3 inches

Medium knives– 4 to 5 inches

Picking a smaller knife, you will be able to easily attach and carry it anywhere.

More to consider- Fixed vs. Foldable blade

  • Foldable blades

It is no secret that a foldable blade would be way more convenient and may turn out safer in many situations. Furthermore, as the knife gets smaller in size as it is folded, it becomes way easier to carry it.

  • Fixed blades

Fixed blades on the other hand require a case to carry them around safely. The casing can be attached to the thighs and only needs to be drawn, making it more convenient when used, since you don’t need to unfold it.

Types of edging

Spearfishing knives are generally offered with two types of edges- The straight edge and the serrated edge. Both types can come in handy, depending on the situation.

  • Serrated edge knives

The serrated edge acts pretty much like a saw, that can cut through tough to cut surfaces with ease. This type of edge has way better slicing capabilities and on top of that, they are thinner, compared to the straight edged blades.

Serrated edge blades are perfect for natural materials, such as seaweed.

  • Straight edge blades

Spearfishing knives with a straight edge enable the spearo to gain more precision and control of the blade whilst using it. The straight edge offers a variety of advantages, such as piercing into objects with ease, which can be considered a con for the serrated edge blades. Straight edges are your top pick when it comes to cutting through human-made materials like fishing lines, nets and nylon.

Tip of the knife

Spearfishing knives are offered with a variety of tips as well, the 3 main being- Tanto, Pointed and blunt tips

  • Pointed tips

The pointed tip knife is perfect when it comes to piercing, as in, for example, killing the fish by puncturing its brain, after spearing it.

  • Blunt tips

Blunt tips may come in handy for other activities while fishing, such as digging or felling. They are also less dangerous, as stabbing yourself or cutting your diving suit is pretty much impossible with a blunt tip knife.

  • Tanto tip

The tanto tips on the other hand are a combination of a blunt and a sharp tip. The sharp edge is right before the finely blunted tip and comes in great convenience for most spearos.

Types of spearfishing knives

There are a couple of types to consider when choosing a knife

Sheepsfoot knives

These knives generally come with a blunt tip and an edge of choice, making them perfectly safe and reliable for emergency situations.

Drop point

These knives have a straight blade spine that goes through the handle and also, a straight edge with a pointed tip- Perfect puncturing knives.

Clip point knives

These knives come with a blade of choice (foldable/fixed) and resemble the features of drop point knives.

Leaf shaped

These knives are generally smaller in size and have a wider blade. They can be purchased with either a serrated or a straight edge, and have a spine that has a slight curvature at the bottom, where the handle is joined.

So, as a whole, spearfishing knives are a MUST when you go diving, as they can quite literally save the life of a fellow spearo, an innocent sea creature or even your own life.

Top amazon picks for the best spearfishing knife

Cressi skorpion

best spearfishing knife

This is pretty much the best spearfishing knife you can get for the money, as it has most major functions a diver could look for. The knife offers a serrated edge on the back, perfect for cutting through harder materials, and on the front you have a sharp, straight edge. You can purchase this bang for the buck knife with either a sharp or a blunt tip, depending on what you need and furthermore, you have a highly ergonomic handle that makes the knife stable and easy to use. The blade is made from stainless steel, so make sure to wash it after a salty dive!

Scuba Pro Mako

As a make, ScubaPro offer a variety of top-quality scuba diving gear. And even though this knife is significantly smaller, it offers everything you may want or need. The knife has a serrated blade, a line cutter and a combined blunt/sharp tip.

On top of all the features, you have a perfect sheath that is steady and holds the knife firmly, until it is time to use it. The scuba pro mako is one of the more expensive options, but price speaks for quaity, making this titanium knife your top pick if you’re looking for a high-end corrosion resistant knife, that requires less maintenance.

Spyderco Atlantic Folding dive knife

Compared to the other recommendations on the list, this knife resembles a saw more than anything. The knife offers a folding, rugged, saw-like blade which makes it the best spearfishing knife if you want to be cutting through rough materials, such as wires and ropes.

And while this knife is not really versatile, compared to the other options on the list, it is the most convenient one, as it folds up and becomes small enough to easily fit in your pocket.

This knife is the perfect choice for you if you’re looking for something more powerful and not a standard sharp blade.

Promate barracuda titanium dive knife

This is one of our top picks when it comes to Promate dive knives. The medium sized titanium blade comes with a comfy, ergonomic handle. The knife can be either blunt tip or pointed. The knife comes with a sheath and can save you in basically every situation, as it offers a line cutter and a rugged back edge. This titanium dive knife is extremely affordable and is definitely another bang for the buck.

US Divers titanium knife

The design of the US Diver’s titanium knife is essentially the same as the previous knife on our list. This dive knife offers a full-sized blade and a line cutter. The 5-inch blade is perfectly sharp and the knife can be disassembled quickly, in case you’re cleaning it thoroughly.

At a slightly higher price, this is the best spearfishing knife if you have a low-3-digit budget.


Although at first thought it may seem like a knife would be unnecessary when you dive to do some spearfishing, it is actually an irreplaceable piece of equipment that every spearfisher should use on regular basis.

The best spearfishing knife would be used when you have speared a fish and have to subdue it. In areas that are known to be often visited by natural predators, you must do that as quickly as possible to avoid attracting them.

It is also used to free yourself, a friend or a dolphin from being entangled in fishing nets or fishing lines. Depending on the type of speargun setup you will be using, you might also have to manually cut fishing lines to reattach your catch to lines that transports it to a float.

We hope we’ve helped you choose the best spearfishing knife for you. Don’t forget to let us know which knife you purchased and how you liked it, as that will add up to the already awesome customer reviews of all the products we showed you above.

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