Advice on Alien Species 

Alien species refers to plants, animals and other organisms that are not native to our waters and have been introduced unknowingly to local environments. 

The spread of alien species is becoming a major issue in both marine and inland waters around the world because they compete with native plants and wildlife and can cause major changes to waterways.

Hull fouling of recreational boats has been identified as one of the key ways that species migrate within a country but recreational boat owners and users can help to ensure that they do not introduce, or help to spread, alien species.

The main means of transport for such species via boating is either by attachment to hull or propeller, or carriage within bilge or ballast water or in engine coolant. In jet skis for example water is retained within the craft when it is returned to the trailer and this water may be discharged into the next waterway site used.  Alien species may also be carried on anchors, warps or on items which have contact with water such as oars and paddles, fishing equipment or tenders. Trailers often contain spaces that hold water during transit and this may also contaminate other waters when the boats are launched.

Boats that are used on more than one water body such as canal and cruising boats, personal watercraft (jet skis), small sports boats, sailing dinghies etc are most likely to present a risk. Boats with water ballast and those which cruise or race to new waters can carry alien species very easily without even knowing. Angling can also transfer species from one lake to another through boat use and also through fishing tackle and nets.

There is action that can be taken to prevent the spread of such species and to help protect our native species. Further advice and information on this issue can be found on the Green Blue website.