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
I was surprised to see that it is estimated that there are around 38 million commercial fishermen and fish farmers!
It takes a lot of workers to keep the restaurants around the country full of fish