SAN FRANCISCO (AP) — They’re lounging, biting each other and generally making a ruckus in numbers not seen in more than a decade. And don’t even think about stealing their anchovies.

San Francisco’s famed Fisherman’s Wharf district is seeing a surge in sea lions.

First appearing at Pier 39 after the 1989 earthquake, the sea lions have become a well known tourist attraction. The number of sea lions — marine mammals that make loud barking calls and can weigh up to a half-ton — crashing at the pier fluctuates over the seasons. On most days more than a hundred can be seen.

But this week, Pier 39 harbormaster Sheila Chandor has counted more than 1,000 sea lions, and that’s the most seen there in 15 years. A huge school of anchovies — a favored food of the pinnipeds — brought them there, Chandor said.

“It’s all about the seafood. It’s all about the food,” Chandor said. “A very good way to put it is they are fueling up for the mating season. It’s spring. They are ready to rock and roll down in the Channel Islands, and we’re a nice pit stop with some great seafood.”