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Environmental impacts of shrimp aquaculture in Asia


Hello everybody, today we’ll be talking about the environmental impacts of shrimp aquaculture here in Asia Presented by Sean and Dorothy When we go to fresh markets here in Hong Kong, we often see shrimps being sold at different prices And they’re coming from many many different places in the world. And these places include the following Close to 80% the world’s total shrimp production came from Asia And Asia has been called the cradle of aquaculture where the culture of fish in fresh water probably began about 500 B.C. And in recent years, Due to increasing demand the subsistence farming methods of old were rapidly replaced by the more productive practices. Traditional methods were replaced by so-called “extensive” farms compensating for low density with increased pond sizes; instead of ponds of just a few hectares, the sizes increases to up to 100 hectares The culture of shrimp is basically a two-step process composed of a broodstock-hatchery phase for producing seed or postlarvae and a grow-out phase usually in earthen culture ponds for ongrowing of fry to marketable size Nonetheless, the The dramatic failures of shrimp farms in Taiwan, Thailand, and many other Asian counties in recent years have raised concerns about the sustainability of shrimp aquaculture, as well as the environmental impact it has on the environment First of all, Mangroves – mangroves are useful in many ways. It produces various goods including charcoal, firewood, construction materials and fishing materials In addition to that, it also acts as a buffer zone providing coastal protection during typhoons and storm surges However, many mangroves in Asia-Pacific region has been removed because the land has to be used for aqua-cultural purposes Especially for aqua-cultural farming and shrimp farming Moreover, the the release of salt water from shrimp ponds has caused salinization of agricultural lands 45,000 ha of once productive rice and also shrimp farms in central Thailand have become an ecological desert because of that The breaking of coastal embankments in the search for sea water has led to salinization of rice lands and a drop in rice production in the last 10 years in Bangladesh And then comes the problem of water pollution Intensive farms, unlike traditional farms need large amounts of feeds to support high densities of shrimp, and flush correspondingly high loads of wastes into coastal waters And cause serious water pollution They also increase the levels of nitrogen, phosphorus and other water quality parameters in the water Last but not least, the growing interest in shrimp farming has been accompanied by numerous transfers and introductions of adults and larvae of these preferred species mainly in the Indo-Pacific region The introduction of these species arouse major concern associated with the wide spread of viruses And it also causes high moralities in the shrimp farms To remedy the current situation, there are different recommended actions that can be taken to promote long-term sustainability in the industry First of all, we can help ensure optimal sustainable use of coastal natural resources, including the maintenance of high levels of biodiversity and real conservation of critical habitats by coordinating the initiatives of various economic sectors Second, we can protect and restore mangrove habitats and wild stocks Of course, at the same time we can help manage pond effluents Legislation and regulation will also help solve the problem And of course, regional cooperation will also be very important in helping promote long-term sustainability in the industry We hope that this video can help you learn more about the situation of environmental impact of shrimp agriculture here in Asia and it’s impacts on the environment and how we can promote long-term sustainability in the industry Thank you very much for listening, goodbye!

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