A newly developed information package – including a brochure and two printable signs for natural harbours and marinas, offers practical advice to support a more sustainable boating culture.
The material has been developed within the framework of ecosystem-based marine management in the Stockholm archipelago (EBHF). Behind the initiative is a working group on nature conservation and recreational boating, bringing together researchers from the Stockholm University Baltic Sea Centre, the Stockholm Archipelago Foundation, Värmdö Municipality, Vaxholm City, and environmental and boating organizations including the Swedish Boating Union, Swedish Society for Nature Conservation, and World Wide Fund for Nature. The content has been scientifically reviewed to ensure accuracy and relevance.
“The purpose of the group’s work is to increase awareness of how recreational boating affects marine environments and how simple choices and behaviors can make a big difference.”
– Cecilia Wibjörn, Stockholm Archipelago Foundation
Why sustainable boating matters
The Stockholm archipelago is home to biologically rich and sensitive marine environments. Shallow, sheltered bays with soft seabeds and underwater vegetation serve as vital nurseries for fish and other marine life. These same areas are often popular anchoring spots.
During summer – when boating activity peaks, emissions from boat engines and toxic substances from antifouling paints also increase. Copper from hull paints, polycyclic aromatic hydrocarbons (PAHs), volatile organic compounds (VOCs), and nitrogen oxides (NOx) can negatively affect marine ecosystems, particularly during the early and most vulnerable life stages of aquatic species.
Boat traffic in shallow waters may also stir up bottom sediments, releasing stored nutrients and carbon, contributing to eutrophication and water quality decline.
Practical steps for boat owners
The brochure and signage provide clear, actionable guidance for different stages of the boating season:
Before launching:
- Avoid toxic antifouling paints. Instead, choose hull cleaning systems such as brush washers, hull covers, or boat lifts.
- If antifouling paint is necessary, use only approved products suited to your home marina.
- Handle winterizing fluids responsibly by running the engine on land and collecting antifreeze to prevent toxic discharge into the sea.
- Choose propylene glycol over more harmful alternatives.
“It’s when you’re standing there working on your boat that you may need a reminder of how to handle different substances that can be harmful to the environment.”
– Cecilia Wibjörn.
At sea:
- Navigate slowly in shallow waters to reduce erosion and sediment disturbance.
- Use alkylate petrol in older two-stroke engines and opt for eco-labeled oils and fossil-free fuels when possible.
- Always empty boat toilets at designated pump-out stations.
When anchoring or visiting islands:
- Anchor in waters deeper than six meters and lift the anchor straight up rather than dragging it along the seabed.
- Avoid disturbing seabirds and sensitive vegetation.
- Take all waste home for recycling.
- Follow Sweden’s right of public access responsibly – do not damage vegetation, light fires on bare rock, or leave gates open.
Visible reminders where they matter most
The working group chose to focus on physical materials that can be displayed in marinas and natural harbours – places where decisions are made in real time.
“Our hope is that boat clubs, municipalities, and other landowners will put this up in marinas to support boat owners in acting sustainably.”
– Sofia Wikström, Stockholm University Baltic Sea Centre
The goal is simple: to increase awareness of how everyday boating choices affect marine ecosystems, and to demonstrate how small behavioral changes can make a significant difference.
Free to download and share
The brochure and A3-sized harbour signs are freely available for download and printing. Boat clubs, municipalities, and individuals are encouraged to share the materials widely to support a more environmentally responsible boating culture throughout the Stockholm archipelago.
By combining knowledge, local collaboration, and practical tools, the initiative aims to ensure that both people and marine life can continue to thrive – above and below the waterline.
Download the files here:
Brochure
Small boat harbour sign
Nature harbour sign
Read more at: ebhf.se
