Manage on-board seawater

There are several ways seawater comes on-board your boat, and with that comes the risk of unknowingly transporting invasive marine pests.

You may not be able to see them: for example, larvae of many invasive marine species will be in the water after a spawning.  

The types of on-board water can include:

  • salt-water engine cooling
  • ballast water
  • live bait tanks
  • sea chests
  • bilge water
  • anchor wells.

Here's what to do:

  • Treat all on-board systems between trips by flushing them with freshwater or an approved treatment.
  • Pump out and mop bilges before you move to another marine area.
  • As much as possible, discharge seawater into the same marine area it came from while you are on a trip. Failing that, discharge it on land that does not drain to the sea.
About marine pests

About marine pests

Find out more about the worst invasive species that could easily spread and cause trouble