WASHINGTON (AP) — Photos of fish with sores may raise concern about long-term environmental effects of the massive BP oil spill — but federal health officials say the Gulf seafood that's on the market is safe to eat. After all, diseased fish aren't allowed to be sold, said Dr. Robert W. Dickey, who heads the Food and Drug Administration's Gulf Coast Seafood Laboratory. "It's important to emphasize that we're talking about a low percentage of fish," Dickey stressed. "It doesn't represent a seafood safety hazard." Two years after the oil spill, scientists cite lesions and other deformities in some Gulf fish as a sign of lingering environmental damage. They can't say for sure what's causing the fish ailments or if there really are more sick fish today than in the past. As marine biologists study the threats to the fish, here are some questions and answers about the safety of seafood: Q: What keeps sick fish off the market? A: Every whole...