Avoid using toxic TBT paints. Keep a garbage receptacle on board , keep it covered, and make sure everyone on board uses it. If you dispose of your garbage at a marina, follow their recycling rules. Never discard any fishing line overboard.
Fishing line is the number one recorded cause of entanglement.
Avoid bring plastic disposables on board , especially plastic bags and six-pack rings. Not only are these products harmful to marine creatures, they also tangle boat props, clog intakes, and litter beaches. Don't throw cigarette butts overboard. Studies have shown that the filters, which don't break down in the marine environment, are harmful to sea birds. Never discharge waste water into the environment .