I'm trying to start making fishing vids with my go pro but the quality doesn't seem good while it's on the video setting for what ever reason. It takes crystal clear picture with normal camera setting. Any suggestions?

Look in the setup options, the resolution can be changed to a higher one. 

Thanks for the tip

Look in the setup options, the resolution can be changed to a higher one. 

x2.

 

You probably have it on Low Resolution to extend your battery life. Depending on the model, you can bump it up to 1080. I recommend buying extra batteries on Amazon (the off-brand ones work as well or better than the GoPro brand) and also, don't leave your blue tooth on unless you are using a remote to constantly start and stop footage. Bluetooth DRAINS the battery. I'd have two extra batteries and keep the footage rolling why you fish, that should get you about 8 hours of total time after switching batteries. I keep mine on the 960 resolution.

I've got a 3+ and on 1080P with wifi on and the backpak battery I can get about 2 1/2 to 3 hours of recording.