Another of the Mini Games you can play during the Main Story found in Yakuza 6 is that of Spearfishing. Not only is it one of the easiest games to play, but it will also see make much more money than some of the other ones. All you really have to do in this Mini Game is shoot fish using a Speargun, as well as various other underwater targets. The type of fish you shoot will determine how many points you receive, the same that will then turn into a certain denomination of money.
Top 3 Spearfishing Mini Game Tips
1) Keep a close eye out for Treasure Chests. Though extremely rare to find, treasure chests will see you earning loads of points (and thus loads of money too). Whenever you are on the seafloor, make sure to always watch out for a possible treasure chest.
2) Always reload manually. Reloading manually can be a pain at times, but if you want to shoot the most fish possible, you will actually want to do it. If you keep hitting the fire button, your weapon will automatically reload. However, this process will actually take twice as long than if you simply reloaded your weapon manually. The most time you lose, the less fish you will catch.
3) Fish that are more difficult to kill are worth the most points. The strongest of fish, such as Sharks, will take multiple hits in order to be killed. This might seem like a pain to do, but fish that require this are actually worth more points (and thus more money). If a fish like this ever appears on your screen, make it a priority to go after it first.