Sydney- Hundreds of swimmers were ordered out of the water, and Sydney's Bondi Beach was briefly closed on January 2 after a shark was spotted. What New South Wales police said may have been a bull shark was sighted 150 maters from the shore by a police helicopter off the popular eastern suburbs beach. ''We've had a lot of fish in the bay, and that's part of sharks' general routine. They eat fish, and they're following the bait ball,'' Bondi lifeguard Anthony Carroll said. A bait ball is a densely packed school of fish that forms when they are threatened by predators.