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Pier Paolo Cito, Associated Press
A view of the grounded cruise ship Costa Concordia off the Tuscan island of Giglio, Italy, Wednesday, Feb. 1, 2012 showing the two collapsed skylights. After a night of rough seas, a crack appeared in the ship and a sheen of oil coming from the ship's stern was seen spreading throughout the day. Bad weather conditions forced the temporary suspension of the recovery operation of the capsized cruise ship Costa Concordia.The ship contains about 500,000 gallons (2,400 tons) of heavy fuel and other pollutants, and fears are growing that those pollutants could spill out, damaging a pristine environment that is home to dolphins, whales and other marine life.

GIGLIO, Italy — A thin film of oil spread from the Costa Concordia cruise ship as waves battered its wreckage off Italy's coast Wednesday, adding to fears of an environmental disaster in the area's sensitive, pristine waters. Authorities were trying to assess how serious and extensive the spread was.

Italian authorities also identified a German woman, Siglinde Stumpf, as being among those killed in the Jan. 13 capsizing of the vessel. Stumpf is the 17th person whose body has been identified. Fifteen others are listed as missing.

The search for the missing has been hampered by rough seas and a decision not to keep looking within the submerged hulk of the ship because it has become too dangerous. Authorities are hoping to pump fuel from the ship, but Civil Protection said that due to bad weather the effort was being suspended again.

A large crack also appeared Wednesday between two large glass panels that formed part of the roof of the massive ship. The film of oil was spreading from a separate part of the ship, apparently the stern.

The ship contains about 500,000 gallons (2,400 tons) of heavy fuel and other pollutants, and fears have grown that those chemicals could damage an environment that is home to dolphins, whales and other marine life.

Floating barriers placed around the ship to protect the water were lifted by winds Wednesday, allowing oil from the engine to spread throughout the bay.

The Italian Port Authority said the leak consisted of a thin film of hydrocarbons. Francesca Maffini, a spokeswoman for Civil Protection, the agency in charge of the rescue effort, said it wasn't yet clear how serious the situation is.

Meanwhile, the ship continued to shift on its rocky perch, moving 7.5 centimeters (3 inches) in seven hours, Civil Protection said in a statement, adding to concerns about the stability of the ship's resting place.

The statement noted that sensors had measured "acceleration of the movement of the bow of the ship," but that the movements later slowed to 2 millimeters (0.08 inches) an hour. It said periods of faster shifting had occurred previously due to tides and weather conditions.

The Concordia's movements are being monitored closely by scientists. There are fears that movement could damage the tanks holding the fuel.

Only once the fuel is pumped out — a monthlong process — can salvage work begin on removing the ship, either floating it in one piece or cutting it up and towing it away.

Gera reported from Rome.