Officers from the Environment Agency Wales have been patrolling beaches around Llanddulas looking for signs of pollution, after the MV Carrier cargo ship ran aground last week.
The Agency says 'natural factors' rather than pollution are thought to be behind reports of dead starfish being washed ashore, but is analysing water samples from area to confirm.
All of the fuel has now been pumped out of the craft, ahead of the break-up operation beginning tomorrow.
Almost all of the oil has removed from the striken cargo ship off the north Wales coast near Colwyn Bay.
The coastguard says barrels of oil and tins of paint onboard are also now being removed. A decision will be made later today about the next stage of the salvage operation.
Workers trying to recover the stricken cargo ship on the North Wales Coast at Llanddulas, near Colwyn Bay have removed 21,000 litres of oil from the ship. It's estimated around 3,000 litres is still on board. Once the oil is removed work will begin to break up the vessel and take it away.
The cargo ship which ran aground on the North Wales coast will be broken up and scrapped, its owners have confirmed. Seven Polish members of crew were rescued after the MV Carrier struck rocks near Colwyn Bay on Tuesday night.
– Reederei Erwin Strahlmann statement
A structural assessment of MV Carrier has revealed severe damage and the vessel has been declared a constructive total loss. PGC Demolition has been awarded a second contract to demolish and remove the vessel. This task is already underway, the work running in parallel with the fuel removal operation. MV Carrier will be cut into manageable sections on the shore. These sections will be taken by road to a designated scrapyard. The demolition of the wreck is expected to take around six weeks, but the pace of operations will be dictated by safety considerations and the weather at the scene.
14,000 litres of oil have been removed from the stricken cargo ship in Colwyn Bay. That's more than half, with an estimated 10,000 litres left. Work continues in four-hour blocks around low tide. It's expected to resume at around 5pm.
Contractors have been working to remove oil from the stricken cargo ship in North Wales. They can only work when the sea conditions are right at low tide. So far things have gone according to plan.
They are making good progress.
A 40mph speed limit remains in both directions of the A55while the operation continues to remove fuel from the MV Carrier, which ran aground at Llanddulas. The cycle path has been closed between Llanddulas and Old Colwyn and a 100m marine craft exclusion zone has been imposed around the vessel.
The owners of a cargo ship which ran aground in rough seas near Colwyn Bay hope to remove around 35 tonnes of fuel from the stricken vessel over the next few days. Work started last night to remove the oil.
Both sides of the A55 nearby have now re-opened.