Fish are caught by many techniques including gathering by hand, spearing, using nets, angling and trapping.
I prefer angling, but I would like to try spear fishing one day
Spear fishing sounds interesting and I understand that you use elastic powered spearguns.
Yes, you can free dive or scuba. It looks interesting but also dangerous with sharks prowling around. 
The thought of diving underwater and using a self-contained breathing apparatus terrifies me as I am slightly claustrophobic.
Oh, probably should stick to the old rod and reel method of catching yourself some dinner
Fishing reel
A fishing reel is a cylindrical device attached to a fishing rod used in winding and stowing line.
Modern fishing reels usually have fittings aiding in casting for distance and accuracy, as well as retrieving line. Fishing reels are traditionally used in the recreational sport of angling and competitive casting. They are typically attached to a fishing rod, though some specialized reels are mounted directly to boat gunwales or transoms.
The fishing reel was invented in Song dynasty China, where the earliest known illustration of a fishing reel
Spearfishing
Spearfishing is an ancient method of fishing that has been used throughout the world for millennia. Early civilizations were familiar with the custom of spearing fish from rivers and streams using sharpened sticks.
Today modern spearfishing makes use of elastic powered spearguns and slings, or compressed gas pneumatic powered spearguns, to strike the hunted fish. Specialised techniques and equipment have been developed for various types of aquatic environments and target fish.
Spearfishing may be done using free-diving, snorkelling, or scuba diving techniques. Spearfishing while using