(Adds comment from conservation groups in paragraphs 9,10)

KUALA LUMPUR, March 29 (Reuters) - Malaysian marine police have seized a trawler carrying about 220 rare sea turtles and arrested 17 Chinese men for poaching, their second such seizure this week, a police chief said on Thursday.

In the two seizures, both involving chases through Malaysian waters, almost 300 turtles were recovered. Most were dead, caught for use in making Chinese medicines. Their shells and skins are also used to make fashion accessories.

"We chased them for about half an hour," said Assistant Commissioner Mohd Sueb, head of marine police for Sabah state, referring to the second seizure on Wednesday.

"They refused to stop their engine so we were alongside and we jumped over and managed to stop the engine."

Armed police, acting on tip-offs, intercepted both trawlers in waters off Sabah, Borneo island, Mohd Sueb said by phone. The turtles were mostly green turtles and hawksbills, both listed as endangered by the Swiss-based World Conservation Union.

Only 20 of the roughly 220 seized on Wednesday were still alive, Mohd Sueb said. Of the 78 turtles recovered in the first seizure on Monday, only five were alive, local media said. All the turtles were handed over to Malaysia's fisheries department.

Nineteen men were arrested in Monday's seizure.

Under Malaysia's fisheries law, the skippers of the trawlers face a maximum fine of 1 million ringgit ($289,000) and the crew could each be fined up to 100,000 ringgit.

Wednesday's seizure, alone, represented a serious depletion of the population of green turtles and hawksbills, conservation groups WWF-Malaysia and TRAFFIC Southeast Asia said a statement.

"We urge the authorities to prosecute these poachers to the full extent of the law. If there is no deterrent, killing of these endangered species will continue," Chris R. Shepherd, of TRAFFIC Southeast Asia, said in the statement.

Asked if police suspected any more turtle poachers were still trawling waters off Sabah, marine police chief Mohd Sueb said: "So far, no news. It depends on the intelligence that we get." ($1=3.460 Malaysian Ringgit)

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