There are two principal sorts of spearguns. The first is air controlled, and the second is elastic fueled. The two firearms can kill fish by firing a lance out at high velocity. The lance penetrates the fish and either kills it straight away, or wounds it enough for you to pull it in and kill it with a blade. Air fueled firearms are siphoned up above water, and the air makes strain in a little chamber. By squeezing the terminating trigger the air is 20 gauge shot lance, pushing it out at rapid.
Rail firearms, or elastic fueled stick weapons work along these lines. To stack the firearm, you just force the elastic (or rubbers!) back and snare the harness (s) over little indents in the lances. The lance is held set up by a little catch, which is dropped when you pull the trigger. The elastic pushes the lance out at fast, and the rail (where the lance sits in) guarantees that the lance takes off in an orderly fashion! A line is joined from the firearm to the furthest limit of the lance, so the lance can't be lost.
Expecting you figure out how to stir things up around town you basically pull the line in (and the lance has a little piece of metal which sticks out guaranteeing the fish can't get off) and get the fish. In the event that the fish is dead you can take it off the lance, and put it on your float or in a boat. On the off chance that it isn't, you get a blade and kill it. Then everything you really want to do is returned the lance, wind the line back around the firearm and burden the rubbers once more.