SOME of Hong Kong's most popular fish could be listed as 'endangered' and subjected to quotas or a sales ban if the Indonesian Government accepts suggestions from the territory. Hong Kong officials have suggested to Indonesia that coral reef fish that are threatened with extinction should be internationally regulated and, if necessary, banned from sale. And one of the territory's two major fish import companies said it would welcome export quotas to control the coastal reef fishing. The rules would cover the most endangered - and expensive - fish such as the humphead wrasse or so mei, and some types of garoupa. The suggestion follows concerns about depletion of the fish, particularly from reefs off the coasts of the Philippines and Indonesia. A report by marine ecologist Robert Johannes last month slammed illegal use of cyanide squirters which stunned the fish, making them easier to catch, but which killed large swathes of reef and thousands of smaller fish. Mr Johannes put much of the blame for the 'vast and expanding ecological tragedy' on Hong Kong firms, which buy from local fishermen to supply the territory - the world's largest reef fish market. He urged the Government to set up a cyanide testing laboratory and monitor the trade more closely, perhaps by issuing firms with import licences. But Agriculture and Fisheries Department fisheries officer Keith Wilson said the fisheries' countries should initiate controls. 'We would welcome these fish being listed under the Convention on International Trade in Endangered Species. That would be a very effective way of dealing with the problem,' Mr Wilson said. 'If it's a problem, list it. We wrote to the Indonesian authorities in January suggesting that and asking them if there was a problem. We have as yet not had a reply. We will write again.' Mr Wilson said fish traders could evade laboratory detection by keeping their stocks until any cyanide had degraded. The Department of Health found no cyanide in fish tested between January 1994 and September 1995, and no cyanide poisoning cases had been reported, a spokesman said. Hong Kong Fish Farming Industry managing director Ricky Lau Hing-nam said: 'I really agree with a quota system for the local fishermen, or the Government could have an export quota.'