Concerns come especially as the oil slick has spread, including to the Southern Islands which teem with wildlife.
Mr Kalai said there have been reported sightings of otters and monitor lizards affected by the oil spill but they have evaded capture.
“We don’t yet know the effects on animals under the water. Many animals share the straits, from dolphins to otters to dugongs and sea turtles … and also other marine life such as coral reefs, crab and fish,” he said.
Minister Lee said that apart from NPark and Acres, the Mandai Wildlife Group, SEA Aquarium, and Singapore Veterinary Association are ready to carry out wildlife rescue and care, if reports of animals impacted by the oil slick surface.
Authorities said that members of the public who encounter wildlife that have come into contact with the oil spill should not attempt to rescue, capture or clean the animals. Instead, they should contact NParks or Acres via their hotlines.
