Another small shark was sighted near the Hoi Ha Wan Marine Life Centre yesterday after sightings of five juvenile sharks on Monday and Friday. The shark, sighted by Agriculture, Fisheries and Conservation Department officers at 4.05pm in Sai Kung, was between 90cm and 120cm long and its species remained unknown. Senior marine parks officer Edward Wong Cheuk-kee said there had been repeated sightings in the park, probably because the water was warm and many fish had congregated in the area. He said the water temperature there was about 26 degrees. A department spokeswoman advised the public not to swim, snorkel, dive or engage in any other aquatic activities even in the shallows as small sharks could reach the area. Shark nets, which can hurt marine life, would not be put in place. WWF conservation director Andy Cornish said experience from countries with healthy shark populations showed people were unlikely to be bitten by sharks of such a small size, but he added: 'It would be unwise for people to enter the water at dawn, dusk or at night if they are bleeding or urinating, as this increases the chance of being bitten.' The Jockey Club Wong Shek Water Sports Centre and Tai Mei Tuk Water Sports Centre remained closed yesterday and offshore activities by the Chong Hing Water Sports Centre were cancelled until further notice.