Chemical tests of material collected to the site of the ongoing North Sea gas leak have revealed no signs of contamination.
A team of experts lead by the Scottish Government collected water and sediment samples two miles from the Total-owned Elgin platform, 150 miles from Aberdeen.
Results show that there has been no marine contamination direct from the incident.
Scientists found some traces of oil-based hydrocarbons in seawater samples, but say it is not directly linked to the gas leak.
The oil appears to be of Middle Eastern origin and its presence is more likely caused by other shipping and industrial activities found in the water.
Chemical analysis of fish is ongoing, but sensory tests last week found them to be untainted.
Richard Lochhead, Scottish Environment Secretary, said: "All data gathered to date continues to demonstrate that the effects on the marine environment of the Elgin gas leak are so far minimal.
"However, as the leak is ongoing, we must remain vigilant and I’ve asked Marine Scotland to continue to play a full part in assessing the situation, including further environmental monitoring.
"Trace amounts of oil in water samples from one of the six sites sampled was detected but this isn’t directly linked to the gas leak and is at concentrations that do not warrant a specific environmental concern.
"We will continue our monitoring activities for the duration of this incident, and respond to any developments as needed. Stopping the gas flow is of course the priority and Total’s efforts to resolve the problem are ongoing."
On Wednesday a helicotper of Total staff flew out to the platform, the fourth such trip since the leak began in March.
The team of 11 experts landed on the platform close to midday and are carrying out preparatory works ahead of an operation to stem the leak.