Subscribe | UPI Odd Newsletter Subscribe DETROIT, Feb. 5 (UPI) -- Some Detroit pet shops are selling unique Valentine's Day gifts -- fish tattooed with messages of love for the recipient. The fish, which are marked with pink lips and the message "I (heart) U," are imported from Asia after being prepared with ink injections or lasers, the Detroit Free Press reported Monday. Advertisement The fish have sold out at three of the seven Detroit shops that sell the unique gifts for between $39 and $50. "It's a way to make a statement to a boyfriend or girlfriend," said Dennis Jones, general manager of Greenwood Pets. "It's quite unique." However, some pet stores have refused to stock the fish as animal rights activists have decried the tattooing process as an exercise in cruelty. "It's neat, but I'm opposed to it because it stresses the fish," said Junjun Cabral of the pet shop Best Pets, which does not sell the fish. "Nothing says 'I love you' like cruelty to animals," said Bruce Friedrich, spokesman for People for the Ethical Treatment of Animals.