Kiera Jefferson
Boat pollution is a pressing issue that poses a significant threat to the health of our oceans and marine life. With the growing popularity of recreational boating and the proliferation of marinas along coastlines, the collective impact of boat pollution has become a cause for concern. From sewage discharge to chemical runoff, boats and maritime operations contribute to water contamination and ecological disruption in a variety of ways. This introduction will delve into the various forms of boat pollution, exploring their harmful effects on ocean ecosystems and highlighting the urgent need for sustainable practices in the maritime industry.
| Characteristics | Values |
|---|---|
| Sewage discharge | Boat sewage increases nutrient levels in the water, contributing to harmful algae blooms (HABs) and reducing oxygen levels, making it difficult for aquatic life to survive. |
| Greenhouse gas emissions | Ferry boats and large passenger vessels release carbon dioxide and other greenhouse gases, contributing to ocean acidification and negatively impacting small organisms like coral reefs, mussels, and crustaceans. |
| Chemical pollution | Spills and runoff of solvents, oils, paints, and cleansers used for boat maintenance and repair can contaminate water bodies, causing nonpoint source pollution. |
| Invasive species | Passenger vessels can introduce invasive species, including noxious weeds, feral cats, and insects, which challenge ecosystems and pose a significant threat to native species. |
| Vessel strikes | Collisions between boats and marine animals, especially vulnerable species like whales and sea turtles, can result in serious injuries or deaths, damaging vessels, and impacting human safety. |
| Water circulation disruption | Poorly planned marinas can disrupt natural water circulation, leading to shoreline soil erosion and habitat destruction. |
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Boat sewage
Raw or poorly treated sewage can spread diseases. Human waste contains bacteria, viruses, and parasites, and contact with contaminated water can cause various health issues, including nausea, stomach ache, vomiting, diarrhoea, sore throat, earache, respiratory problems, skin infections, and rashes. Serious waterborne diseases include hepatitis, typhoid, dysentery, and cholera. Sewage can also contaminate shellfish beds, impacting both the ecosystem and those who rely on shellfish for their livelihood.
To minimise the impact of boat sewage on the ocean, boaters should aim for zero discharge of sewage into recreational waters. While on board, all sewage should be contained in an approved MSD. Upon returning to shore, portable toilets should be emptied at approved waste handling facilities, and MSDs should be discharged at pump-out stations. Marinas should be carefully designed and located to facilitate natural flushing and renew water quality.
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Chemical cleaners
Boats and marinas can release pollutants that have a detrimental impact on water quality and marine life. While individual boats and marinas typically discharge only small amounts of pollutants, the cumulative effect of thousands of boaters and marinas can cause significant water quality issues in lakes, rivers, and coastal waters.
The use of chemical cleaners in boating activities can have several negative consequences for the marine environment. Firstly, they can directly harm plankton and fish. Chlorine, ammonia, and phosphates are toxic to these organisms, disrupting their growth and survival. Secondly, chemical cleaners contribute to water pollution by increasing the concentration of pollutants in aquatic ecosystems. This, in turn, can lead to increased algae growth and a decrease in oxygen levels, creating an imbalance in the marine ecosystem.
To mitigate the harmful effects of chemical cleaners, boaters can opt for non-toxic and environmentally friendly cleaning products. By choosing cleaners that do not contain harmful chemicals, boaters can reduce the risk of polluting the water and harming aquatic life. Additionally, proper boat maintenance practices can help minimize the use of chemical cleaners. This includes using drop cloths to catch any spills or drips during cleaning and maintenance, as well as vacuuming up loose paint chips and dust to prevent them from entering the water.
By adopting more sustainable practices and choosing non-toxic alternatives, boaters can play a crucial role in reducing the impact of chemical cleaners on the marine environment and promoting the long-term health of our oceans.
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Fuel spills
Oil spills can harm sea creatures, including marine wildlife such as turtles, birds, and fish. They can also ruin coastal areas, making beaches unsafe for recreation and contaminating seafood sources. The cleanup process after an oil spill is complex and challenging, requiring scientific expertise to assess the impact and implement effective restoration projects.
To address fuel spills, it is crucial to take immediate action. The first step is to identify the cause and source of the spill and, if possible, stop it at the origin. Notifying the relevant authorities, such as the marina or fuel dock, is essential as they can provide oil absorbent pads and booms to contain the spill. Any sheen on the water indicates the need to alert the U.S. Coast Guard National Response Center. Absorbent materials, such as socks, pads, and pillows, can be utilized to minimize damage while awaiting professional assistance.
It is important to note that the use of detergents or dish soap on fuel spills should be avoided. While it may give the appearance of removing the spill, it actually disperses it into smaller droplets, making the cleanup more challenging and increasing toxicity for marine life. Instead, boaters should follow guidelines to prevent fuel spills, including careful fueling of boat engines, proper recycling of used oil, and appropriate disposal of worn motor parts.
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Invasive species
Boats and ships are a major vector for the introduction and spread of invasive species, which are prolific breeders and can quickly become established in new environments where they don't belong. Once established, invasive species are difficult and expensive to eradicate.
Shipping is the most significant vector for the introduction of marine invasive species. As much as 10 billion tonnes of ballast water is transported by ships around the world per year, carrying up to 7,000 species of aquatic plants, microbes, and animals every hour. Ships fill their tanks with seawater to balance cargo weight at their loading port, and release it at their destination, along with whatever species it contains. Ballast water is now often treated to avoid the spread of invasives, but historically this was not the case.
- Lionfish, which are voracious predators with virtually no natural enemies, are decimating native coral reef fish populations in the Atlantic Ocean.
- Zebra mussels, which were introduced to North America in ballast water and have spread to numerous lakes, clogging water intakes and pipes and attaching themselves to boat motors, hulls, and docks.
- European crab, which has been carried in ballast water and sold as fish bait, has established populations on both US coasts and in southern South America, Australia, South Africa, and Japan, affecting the commercial shellfish industry.
- A strain of algae native to the Indian and Pacific Oceans escaped from aquariums and spread in the Mediterranean, replacing native plants and depriving marine life of food and habitat.
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Vessel strikes
Marine mammals, sea turtles, and protected fish species are among those at risk of vessel strikes. Sea turtles, in particular, are vulnerable as they surface to breathe, bask near the surface, or forage in shallow areas. Adult sea turtles appear to be at greater risk during breeding and nesting seasons. It is estimated that hundreds of sea turtles are struck by vessels in the United States each year, with vessel strikes being one of the leading causes of sea turtle strandings. In Florida, injuries consistent with vessel strikes are observed in 20-30% of stranded sea turtles.
Whales are also commonly struck by vessels, with shipping lanes overlapping with whale habitats. In the Atlantic, approximately one-third of all right whale deaths are caused by vessel strikes. Other whale species at risk include the blue whale and humpback whale. To reduce the risk of vessel strikes on whales, measures such as establishing vessel speed restrictions, recommended vessel routes, and dynamic management areas have been implemented.
Protected fish species, such as the sturgeon and giant manta ray, are also vulnerable to vessel strikes. Injuries consistent with vessel strikes, such as lacerations on pectoral fins from propeller strikes, have been observed in giant manta rays. When encountering these protected fish species, vessel operators are advised to reduce their speed and slowly distance themselves from the animal.
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