A dolphin was found shot dead on a California beach — and an animal rescue group is now offering a reward for information leading to the arrest and conviction of the gunman.

The dolphin’s remains were found on Manhattan Beach about 20 miles south of Los Angeles, El Segundo-based Marine Animal Rescue wrote on Facebook on Friday.

A necropsy later revealed that the sea mammal had been killed by a gunshot wound, the animal rescue group said.

“There is NO excuse for such brutality against these beautiful animals,” the group wrote in its post.

The animal rescue added it will offer a reward of $5,000 if a tipster comes forward with information that leads to the arrest and conviction of the person who shot the dolphin.