While marine pollution is often associated with plastic waste and oil spills, marine sound pollution has become one of the fastest-growing threats to ocean life.
Unlike visible pollution, underwater noise cannot be seen, yet it significantly affects marine species that rely on sound to communicate, find food, navigate, avoid predators, and reproduce.
If you’re interested in NIMEPA’s broader efforts to reduce marine pollution, explore our Pollution Reduction Programs and other Our Initiatives to learn how communities and organizations are working together to protect Nigeria’s marine environment.
What Is Marine Sound Pollution?
Marine sound pollution, also known as underwater noise pollution, refers to excessive human-generated sounds in oceans, rivers, and coastal waters. Since sound travels much faster and farther underwater than in air, even distant noise sources can disrupt marine ecosystems.
Many marine animals—including whales, dolphins, sea turtles, fish, and crustaceans—depend on underwater sound for survival. Excessive noise interferes with these natural behaviors and threatens marine biodiversity.
For a global overview of underwater noise, the National Oceanic and Atmospheric Administration (NOAA) provides valuable educational resources on ocean acoustics and marine mammals.
1. Commercial Shipping
Commercial shipping is the largest continuous source of underwater noise worldwide.
Noise comes from:
- Ship engines
- Propellers
- Machinery vibration
- Hull movement
As shipping traffic increases, background ocean noise also rises, making it more difficult for marine mammals to communicate over long distances.
Environmental Impact
- Disrupts migration routes
- Masks communication signals
- Alters feeding behavior
- Reduces breeding success
The International Maritime Organization (IMO) continues to promote guidelines that encourage quieter ship designs and operational practices to reduce underwater noise.
2. Oil and Gas Exploration
Seismic surveys used during offshore oil and gas exploration generate extremely powerful sound waves through compressed-air guns.
These sound pulses can travel hundreds of kilometers beneath the ocean surface.
Environmental Impact
- Hearing damage
- Habitat displacement
- Increased stress
- Disrupted breeding and feeding behavior
Responsible environmental assessments are essential before offshore exploration begins. Learn more about environmental stewardship through NIMEPA’s Collaboration & Partnerships initiatives, where government agencies, industry, and environmental organizations work together to protect marine ecosystems.
3. Offshore Construction
Marine infrastructure projects such as ports, bridges, offshore platforms, and wind energy installations often require pile driving and heavy machinery.
These activities produce intense underwater noise over extended periods.
Environmental Impact
- Disturbs fish spawning areas
- Damages sensitive habitats
- Increases stress among marine organisms
- Causes temporary habitat abandonment
Before major marine projects commence, environmental impact assessments play a critical role in minimizing ecological disruption.
4. Naval Operations and Sonar Systems
Military sonar systems are used for navigation, surveillance, and submarine detection.
Although important for maritime security, high-intensity sonar may disrupt the behavior of marine mammals.
Environmental Impact
- Panic responses
- Interrupted communication
- Altered migration
- Increased risk of strandings
The International Union for Conservation of Nature (IUCN) highlights the importance of protecting vulnerable marine species from multiple human-induced threats, including underwater noise.
5. Dredging Activities
Dredging is necessary for maintaining navigation channels, expanding ports, and supporting coastal development.
However, dredging equipment continuously produces underwater noise while disturbing seabed habitats.
Environmental Impact
- Reduced feeding efficiency
- Fish displacement
- Habitat degradation
- Increased sediment disturbance
NIMEPA regularly advocates for sustainable marine development that balances economic growth with environmental protection. Read more through our Blog for practical insights into marine conservation.
6. Recreational Boating and Water Sports
Motorboats, speedboats, jet skis, and recreational tourism also contribute to underwater noise, particularly in shallow coastal waters where many marine species breed and feed.
Environmental Impact
- Disturbs dolphins and sea turtles
- Interrupts fish communication
- Alters natural marine behavior
Simple actions such as reducing boat speeds in sensitive habitats and observing marine wildlife responsibly can help reduce unnecessary noise.
Interested in supporting conservation efforts? Consider joining NIMEPA as a Volunteer and help raise awareness about protecting Nigeria’s marine environment.
7. Underwater Mining and Industrial Activities
Emerging offshore industries, including seabed mining and industrial extraction, introduce long-term acoustic disturbances through drilling equipment, heavy machinery, and support vessels.
Environmental Impact
- Habitat degradation
- Biodiversity loss
- Chronic stress
- Long-term ecosystem changes
As these industries expand, effective environmental regulations and continuous monitoring become increasingly important for protecting marine ecosystems.
The United Nations Environment Programme (UNEP) continues to advocate for sustainable ocean management and reduced environmental impacts from industrial activities.
Why Marine Sound Pollution Matters
Marine sound pollution affects far more than individual animals.
Long-term underwater noise can:
- Reduce reproductive success
- Interrupt migration routes
- Affect predator-prey relationships
- Increase stress hormones
- Drive species away from critical habitats
- Reduce ecosystem resilience
Healthy oceans require not only clean water but also a healthy acoustic environment.
If you’re passionate about marine conservation, explore NIMEPA’s Membership program to become part of a growing network committed to protecting Nigeria’s oceans.
How We Can Reduce Marine Sound Pollution
Reducing underwater noise requires collaboration between governments, maritime industries, researchers, conservation organizations, and coastal communities.
Effective solutions include:
- Designing quieter vessels
- Improving propeller technology
- Conducting comprehensive environmental impact assessments
- Monitoring underwater noise levels
- Establishing quiet marine zones
- Encouraging sustainable shipping practices
- Raising public awareness through education
The Convention on Biological Diversity (CBD) also recognizes the importance of addressing underwater noise as part of broader marine biodiversity conservation efforts.
