My wife is an expert on killing them... she has 6 yrs of Caribbean experience
First go to home depot and get the ammo!
Treat the lines and fenders with Ortho insect spray to help prevent them getting aboard. You need a gallon!
Boaric acid in all the bilges and cupboards.
Bag or remove all food from the cupboards and refrigerator and then bomb the boat twice while you are in a hotel.
Repeat all of the above as necessary.
It works but you need to do it quickly before they breed for the tenth time.
all those chemicals are dangerous some listed human carcinogens except for boric acid. Boric acid< powdered> is approved even for food use and will kill all vermin of this type and their spawn in three weeks or less. Please don't add more chemicals to our water that will add to the man made chemical load we have already added to our water. When I was a kid the water was clean now we cant eat the fish because of toxic buildup from mans chemical factories. I'm 66, worked for EPA for 24 years. Just imagine what the fish consumption will be in another fifty years if we keep adding to the pot?
I know they say you can eat a couple of servings a week but I don't trust them do you? The old timers used to put funnels on dock lines to keep vermin from getting aboard