A 25-year-old Thai sea turtle died from blood poisoning on Tuesday, never recovering from an operation to remove 915 coins from her stomach, thrown into her pool for good luck, veterinarians said.

The green turtle named Omsin, "Piggy Bank" in Thai, underwent a seven-hour-long operation this month to remove five kilograms of coins, which she had mistaken for food.

Omsin, "Piggy Bank" has died after surgery to remove five kilograms of coins. Credit:AP

But Omsin, who lived at a conservation centre in Chonburi, east of the Thai capital Bangkok, was rushed into intensive care on Sunday night, breathing too slowly.

She received an emergency operation on Monday, after which she went into a coma.