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
So you can use a rod and reel for angling?
Of course, that is the most popular way of catching fish for recreational purposes
pastimes. Fishing tournaments are held, and caught fish are sometimes kept as preserved or living trophies. When bioblitzes occur, fish are typically caught, identified, and then released.
According to the United Nations FAO statistics, the total number of commercial fishermen and fish farmers is estimated to be 38 million. Fisheries and aquaculture provide direct and indirect employment to over 500 million people in developing countries. In 2005, the worldwide per capita consumption of fish captured from wild fisheries was 14.4 kilograms, with an additional 7.4 kilograms harvested
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