Grey mullets and gei wai shrimps are common ingredients we find on the dining table of a Hong Kong household. Located at the northwest of the city, both Mai Po and Inner Deep Bay are nature reserves with freshwater fish ponds and gei wai (ponds enclosed by bunds). Back in the 1940’s, a large number of new immigrants from Mainland China came to Hong Kong with their technique of gei wai. As they cultured gei wai shrimps, the technique of gei wai also developed gradually in Hong Kong. In the 1960’s, pollution of watercourses prompted fishermen who operated gei wai to switch to selling freshwater fish, which was more lucrative. Currently, there is no gei wai run by fishermen. The 1970’s was the heyday of the fish culture industry, but local fish farmers faced various problems in the 1990’s, which was the time when the fish culture industry also started fading out. In fact, Mai Po and Inner Deep Bay not only provide food for human consumption, but also serve as key stopover points and wintering sites for the 50 million migratory waterbirds every year. This is exactly why World Wide Fund for Nature Hong Kong manages Mai Po Nature Reserve – to conserve this piece of wetland of significant ecological value. Now they still harvest gei wai shrimps at night in summer in the one and only operating gei wai in order to showcase this disappearing technique to the public. That both human and birds feed on fish may seemingly make them rivals. Not to mention that fishermen and bird watchers do not see eye to eye with each other. Yet, Hong Kong Bird Watching Society has been collaborating with fishermen in various ways and projects since 2012, with a view to enhancing fishermen’s knowledge of nature conservation as well as the public’s understanding of the current situation and history of local pond fish farmers. Gei wai operation technique and fish culture technique have been listed in “The Intangible Cultural Heritage Inventory of Hong Kong”. Will fish ponds disappear st