Microplastics in the Ocean - the hidden crisis

As a marine biologist specialising in plankton, my work has placed me at the forefront of research into how microscopic life reflects the health of our oceans.

For decades, my research has focused on understanding the marine ecosystem from its very foundation. Plankton may be microscopic, but they underpin the entire ocean food web - from the smallest fish to the largest whales, and ultimately the systems we depend on.

Today, that foundation is under threat from plastic pollution in the ocean.

Exploring the microscopic world that sustains our oceans

To study plankton, I collect samples using a fine net towed through surface waters - an underwater butterfly net, not so different from the one used by Charles Darwin in 1832¹.

He described his findings with awe:
“Many of these creatures… are most exquisite in their forms & rich colour.”¹

Two centuries ago, those samples were pristine. Today, mine are not.

Invisible invaders: How microplastics enter the ocean

Every plankton sample I collect now contains microplastics. These particles come from the breakdown of larger plastic waste, but also from a less obvious and increasingly significant source: microfibres from synthetic clothing².

This is not just an aesthetic loss - it is the beginning of a much larger problem. Marine plastic pollution moves upward through the food chain, carried by organisms as they consume one another.

From tiny plankton to Blue Whales: The ripple effects of plastics

Marine animals are not equipped to distinguish plastic from food. Floating particles are often mistaken for prey.

The effects of plastic pollution are increasingly well documented. Studies estimate that:

• 12% of marine mammals
• 35% of seabirds
• 47% of sea turtles

…are affected by plastic ingestion³, with measurable mortality linked to internal injury and obstruction.

More recently, scientists have identified a new condition - plasticosis - a form of internal scarring caused by persistent plastic exposure⁴.

While these impacts are most visible in larger animals, the process begins much earlier - and much smaller.

Your wardrobe’s hidden impact on the ocean

At the microscopic level, the problem becomes even more striking.

In 2017, I documented a planktonic organism choking on a single blue microfibre in footage later featured by the BBC⁵. You can watch it here

These microfibres from washing clothes are now one of the largest contributors to plastic pollution in oceans. Polyester fleece, in particular, is a major source. A single wash can release hundreds of thousands to millions of fibres into wastewater systems⁶.

Even in Antarctica - often considered one of the most pristine environments on Earth -  microplastics are now present in every water sample studied at some locations⁷.

Following plastics through the ocean food chain

Once microplastics enter plankton, they begin their journey through the entire marine food web. Small fish consume plankton, larger fish consume them, and predators follow.

Plastic particles also carry pollutants, transferring toxins through the food chain⁸.

A blue whale feeding on krill may ingest millions of microplastic particles each day. Plastic pollution in the ocean does not remain at the microscopic level - it travels through every layer of marine life.

When ocean plastics reach our plates and lungs

This issue is not confined to the ocean. Microplastics are now present in our everyday environment, including the air we breathe. Indoor environments can contain thousands of inhalable particles per cubic metre⁹.

Once inhaled, these particles can lodge deep in the lungs. Synthetic fibres have been associated with respiratory irritation and disease¹⁰.

The connection between what we wear, what we release into the environment, and what ultimately returns to us is becoming increasingly clear.

Small choices, big impact: reducing plastics in the sea

The scale of microplastic pollution can feel overwhelming. But one of its defining characteristics is that it often begins with small, everyday actions.

One of the most effective ways to reduce plastic pollution in the ocean is to reconsider the materials we wear. Synthetic fabrics, particularly polyester fleece, are a significant source. Reducing reliance on these materials can directly limit the amount of microplastic entering the environment.

Choosing wool over polyester fleece to protect marine life

In April 2026, I returned from an expedition to Antarctica aboard the Douglas Mawson, where I was working as a guest lecturer. During the journey, I chose to wear merino wool fleece garments - specifically PureFleece® from Woolf - as an alternative to traditional polyester layers.

The difference was notable: the garments were warm yet breathable, comfortable over extended periods, naturally resistant to odours, and required less frequent washing - an important factor in reducing microfibres. Unlike synthetic fleece, merino wool does not shed persistent microplastic fibres into waterways.

How everyday decisions shape the health of our oceans

The story of plastic pollution in the ocean is not just about pollution - it is about connection. From the clothes we wear, to the fibres they shed, to the plankton drifting in the sea, to the fish we eat - each step is part of the same system.