A new study from the Institute of Marine Research (HI) in Norway warns that the environmental impact of oil spills may be far greater than previously assumed.
The research shows that tiny oil droplets released during spills can collide with and stick to vulnerable fish eggs in large numbers — a factor not currently included in risk assessments.
Oil droplets overlooked in risk models
Traditionally, risk evaluations focus on dissolved oil in the water. But major spills also release countless microscopic oil droplets. These droplets spread across wider areas and stay concentrated in the upper 50 metres of the sea — the same zone where many fish species spawn.
Sticky eggs are at the highest risk
The study highlights haddock as particularly vulnerable. Haddock eggs have a naturally sticky surface. When these eggs encounter oil droplets, the droplets can cling to them like flies to flypaper. This increases exposure time and raises the risk of both acute mortality and long-term developmental damage.
Previous laboratory research has demonstrated that even a small oil droplet can have a substantial impact on heart function in haddock larvae. The new study strengthens concerns that the early life stages of fish could be harmed even by moderate spills.
Simulation near Lofoten
Researchers simulated a 90-day oil spill south-west of Lofoten — a critical spawning area for the world’s most extensive stock of Northeast Arctic haddock.
The model showed repeated collisions between fish eggs and oil droplets. The authors say current assessment methods significantly underestimate the scale of potential damage.
Call for new risk frameworks
The findings have prompted senior marine scientists to urge changes in how oil spill risks are calculated. They argue that future management must include the effects of oil droplets, not just dissolved oil, especially as climate and geopolitical pressures shift activity in northern waters.