Received: 05-02-2017
Accepted: 09-03-2017
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Polyculture of Whiteleg Shrimp (Litopenaeus vannamei) and Red Tilapia (Oreochromissp.) -A Response to Climate Change inGiao Thuy District, Nam Dinh Province
,
Ngo The An
3
Keywords
Climate change, polyculture, Red Tilapia, Whiteleg shrimp
Abstract
This study aimedat examining the model of integrated culture of whiteleg shrimp with red tilapia in the context of climate change (CC), an expectation for a good model for the local farmers to deal with climate change. The experiment was carried out in six ponds, ranging from 2000 to 2500 m2, in 2015 and 2016, in Giao Phong commune, Giao Thuy district, Nam Dinh province. The trials consistedof 6 models designed in six ponds: two integrated farms in freshwater, and four monoculture shrimp farms for control, two in brackish water and two in freshwater. In the integrated culture models, red tilapia was added at a density of 2 fish per m2to a pond stocking 100 white shrimp per m2; the shrimp were stocked twice but red tilapia was stocked only once per year. In the monoculture models, whitelegshrimp was stocked at the same time and the same density as those in the integrated models. Comparingto the monoculture of shrimp in both brackish and fresh water, the polyculture of shrimp with red tilapia where whitelegshrimp was acclimatized to fresh water resulted in lower disease incidence, reduced the cost of drugs and chemicals by about 30%, and gained more than doubled the economic benefits. Farmers and the local authorities in the district highly appreciated the results of the integrated culture model. This model can be considered as a strategy to increase the adaptive capacity of aquatic production in the study area.
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