If you have a boat registered in California that is only used in "Marine" waters (that is, the Ocean) watch out on your registration renewal. The DMV has added a $16 Quagga and zebra mussel infestation prevention fee. You are exempt if your vessel is used exclusively in marine waters, but you have to explicitly opt out. Make sure you check the "Used Only in Marine Waters" box and subtract $16 from the amount due.
You can opt out renewing online as well.
You can opt out renewing online as well.