Mar 26

spearfishing with diving knifeAmongst all the gear required by a spearo, a spearfishing knife gets a lot of raised eyebrows. And even sometimes the size of a general purpose diving knife too gets a lot of sulk. However, the diving knives are actually awesome – huge knives have a special place in the diving world. How they are concerned with spearfishing is, however, a totally different issue.

Spearfishing knives are extremely useful and fulfill two very special purposes.

1. To end the life of your speared fish in a humane way

As spearos, you have a responsibility towards the animals that you catch of treating them with respect. Whether you believe it or not, there is a close watch of thousands of eyes on you regarding how you treat the ocean environment.

Quick killing is just a good practice and if your shot doesn’t accomplish the job, you might have your blade not working. So, how would you kill a fish properly with a knife?

The proper way of killing a fish is to sever its brain by piercing knife between the eyes on top of the head and moving the knife strongly backward and forward.

During diving, i.e. underwater, this can be done with a well placed stab or two if your fish is indeed very large.

2. As a security measure if you are entangled

Entanglement can be a major issue underwater. Anything from line, mono filament, and even plants like sea grass and kelp can cause problems, for which a knife should be kept ready.

A Great Knife for Spearfishing

For a great spearfishing, the knife should as simple as possible. It should have the following characteristics:

Pointed Tip – Spearfishing needs a really pointed knife. After all, you have to get directly into the brain of the fish. It may sound gruesome, but a semi-rounded knife could be more troublesome for the fish.

Narrow – Avoid getting your float line or any other sort of ocean FOD between your leg and your dive knife, by keeping a thin knife and sheath.

Serrated – If the knife is serrated, it requires less effort to get to where it needs to and easily cuts bone and stiff material that heavier fish has.

Small and Tough Sheath – If the sheath is small and tough, you will have less drag with no snag. You should review the sheath carefully before buying the knife.

Taking Care of the Knife

Diving knives are subjected to saltwater and so, should be taken proper care. As any of the knives is made of some sort of metal, which is bound to rust in saltwater, you should:

  • Rinse your knife with fresh water every time after a dive and never leave the saltwater remain on its blade overnight.
  • Coat the blade with a super thin layer of petroleum jelly after it is dried.
  • If the knife has caught a bit of rust, some spearos recommend immersing it in white vinegar for, say, an hour and then rubbing the rust off gently with steel wool.

cutting entanglement