A rare species of dolphin was rescued and taken to Ocean Park last night after being found stranded on a Lamma Island beach. The young rough-toothed dolphin - a species never before seen alive in Hong Kong waters - was spotted by a passer-by on Lo Tik Wan beach in the afternoon. Dolphin experts from the Agriculture, Fisheries and Conservation Department and Ocean Park examined the mammal at the scene and tried to push it back out to sea. A department spokeswoman said: 'Initially our officers tried to take it back into deeper water but it was pushed back by the strong waves.' They decided instead to take the animal to Ocean Park, carrying it in a sling to a nearby pier where it was transferred to a police boat. The grey-coloured dolphin is a young adult, measuring 2.1 metres long. It has no visible wounds on its body and the reason for the stranding is unknown. Ocean Park said last night the animal would be released back into the wild if it recovers. According to the Hong Kong Dolphin Conservation Society, the only previous record of a rough-toothed dolphin in Hong Kong was when a carcass was spotted floating near Green Island in May last year. Rough-toothed dolphins, Steno bredanensis, have white patches on their body and pink or white-coloured stomachs. They usually live in close-knit groups of 10 to 20 individuals. Their range is limited to deep tropical and warm temperate waters worldwide, the conservation society website says. It was the second dolphin stranding on Lamma in as many months. A Chinese white dolphin was found dead on a rocky beach on the northern part of the island last month with a rope knotted around its tail. Samuel Hung Ka-yiu, chairman of the dolphin conservation society, said at the time that it was rare for Chinese white dolphins to appear in Lamma waters as most of them tended to cluster around north Lantau. Four Chinese white dolphins have been found dead in Hong Kong so far this year. There were 14 deaths of the protected species reported last year. Dolphin and whale strandings remain a mystery, with scientists speculating that some of the animals may become confused in shallow water, or that they may deliberately beach themselves when ill or injured.