Highlight As a Marine Conservation Device in Hong Kong In 1960′s, the Hong Kong Government promoted trawling technology to the local fishing industry, and the local waters had been bottom-trawled ever since. After 30 years, the seabed was reduced to a muddy flat. The ruined marine habitat provided little shelter for fish to rest against the constant ocean current. The local fishery deteriorated drastically; and the Hong Kong Government reversed its policy on local trawling and began marine conservation.