Plans to refloat a stranded humpback whale in shallow waters off Germany's coast have been scrapped, with regional Environment Minister Till Backhaus saying the rescue concept must be revised.
The 12-metre-long male whale, nicknamed Timmy by German media, remains stuck off the small island of Poel near the town of Wismar.
Lifting the animal with air cushions and transporting it using pontoons and a tarpaulin was not an option, Backhaus told reporters late on Wednesday.
A private initiative that had received backing for the plan about a week ago is now working on a revised approach, he said. Any further measures must be scientifically sound, take into account the animal's condition and be coordinated with authorities.
Experts from the International Whaling Commission (IWC) recommend a calm, palliative approach. Backhaus said that this assessment was consistent with earlier scientific advice that active rescue attempts would be unlikely to succeed and could pose significant risks.
The whale briefly swam off on Monday after three weeks in one spot but stopped after about two hours near the entrance to Wismar Bay, which leads to the Baltic Sea.
A tracking device has since been attached in case it moves again.
Recent efforts have focused on easing pressure on the whale's body by reshaping the seabed so it lies more supported in the water. Its back has also been covered with wet cloths to protect it from the sun.
The handling of the case has drawn criticism. Backhaus said the private initiative had not received formal approval but was being tolerated under German law, which allows assistance to distressed animals. Animal welfare remained the sole guiding principle, he said, with veterinarians on site around the clock.
Timmy has been stranded in Wismar Bay since March 31 after repeatedly running aground in recent weeks at various points along the Baltic coast.