Public asked to avoid the area
A whale carcass has led to the the discolouration in the tidal pool near Groudle Glen, the Department of Environment, Food and Agriculture has confirmed.
Pictures had surfaced on social media showing copper-coloured swirls in the water at Sea Lion Rocks.
The authority says it's likely the remains were washed in by a high tide, and it is hoped it may be dispersed with upcoming spring tides.
In the meantime, the public are being advised to avoid the carcass as a matter of health and safety.
Government suffers fresh defeat over North and West Area Plan
Steam Packet confirms overnight sailings cancelledÂ
Plans to be submitted for Ramsey Harbour flood defence scheme
"Substantial progress" made on design of new Castle Rushen High School, says minister
"Demand for green, clean energy is rising amongst all businesses", says MUA