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Light Pollution In The Sea

By 28 December 2023No Comments


When we think of light pollution, we often picture cities bathed in the glow of streetlights and neon signs. However, light pollution extends far beyond urban areas, reaching even the depths of the sea.

In this article, we explore the lesser-known issue of light pollution in our oceans and its impact on marine life.


The Pervasive Problem

Light pollution in the sea primarily results from artificial light sources along coastlines, industrial activities, and vessels on the water. These lights disrupt the natural darkness of the marine environment, affecting both the surface waters and the deep ocean.

Disrupting Natural Cycles

Many marine species, including sea turtles and various fish, rely on natural light cues to navigate, find prey, and reproduce. Artificial light disrupts these essential behaviors, leading to disorientation and misdirection. For sea turtles, coastal developments with bright lights can lead hatchlings away from the ocean, reducing their chances of survival.

Disoriented hatchling distracted by street lights

Altering Ecosystems

The penetration of artificial light into the water column can alter entire ecosystems. Phytoplankton, the base of the marine food web, are sensitive to light and can be disturbed by excessive illumination. Changes in the distribution of phytoplankton affect the entire food chain, impacting fish, marine mammals, and seabirds.

Masking the Stars

The sea also faces the issue of skyglow, where light pollution from coastal areas obscures the natural night sky. This phenomenon can confuse nocturnal species that use the stars for navigation. Birds that migrate at night and rely on celestial cues can become disoriented, leading to fatal collisions with structures and vehicles.

Seductive Shorelines

Artificial lights on coastal properties create what is known as “light traps” for marine organisms. Insects are particularly drawn to these lights and can attract insectivorous birds. As a result, these birds may become prey to predators or collide with windows and buildings.


Recognizing the problem of light pollution in the sea is the first step toward addressing it. Here are a few measures that can help mitigate its impact:

  1. Shielded Lighting: Installing well-designed, shielded lighting fixtures can direct light where it’s needed and reduce unnecessary spill into the ocean.
  2. Low-Impact Practices: Encouraging responsible coastal development with minimal lighting can protect nesting habitats for species like sea turtles.
  3. Regulations and Legislation: Implementing and enforcing regulations to reduce light pollution in coastal areas can be effective.
  4. Public Awareness: Educating the public about the environmental impact of light pollution and its consequences for marine life is vital.


Light pollution’s adverse effects on marine ecosystems are often underestimated. While it may not be as visible as other forms of pollution, it poses a significant threat to the delicate balance of life in our oceans. By raising awareness and taking steps to reduce light pollution, we can help protect the marine environment and maintain its natural rhythms and beauty.