A Hawaiian monk seal whose carcass was found on a beach on Kauai’s west end Monday died of natural causes, according to the National Oceanic and Atmospheric Administration.

It was the second seal death reported this year on Kauai. On March 10 the carcass of a young female seal was found at Salt Pond Beach Park in Hana­pepe.

Jamie Thomton, Kauai Marine Mammal Response Program coordinator for NOAA, said the seal found in March also died of natural causes.

The seal found Monday was a 400-pound adult male, identified as 1031, whose carcass was found near Pakala Village, Thomton said Friday.

A necropsy determined that the seal died of natural causes.

“There was no immediate evidence of foul play,” Thomton said.

Thomton said a security guard from nearby Nii­hau Ranch found the badly decomposed carcass on the state beach on the Kau­ma­kani coast on the southwestern side of the island.

Thomton said collection of tissue samplings was limited because the carcass was so badly decomposed, and said the seal had been dead for at least 48 hours.

In February the Coast Guard flew a juvenile monk seal to Oahu after the animal was found in a lethargic state near Mahu­kona on the west coast of Hawaii island.

The juvenile seal, identified as RK68, later died of injuries from swallowing a fishhook, a NOAA necropsy found. An X-ray showed the hook had lodged in its esophagus and that scar tissue that formed around the hook suffocated the seal.