During rainy season, floods often occur creating unfavorable weather conditions for shrimp farming: temperature changes during a day and widespread thunderstorms making abrupt changes in water environment, causing shock in shrimps and possible disease outbreaks.
1/ Abrupt changes in environmental factors and aquaculture pollution causing shocks in farming species and leading them to stop eating, or even death due to infectious diseases:
• Water temperature drops suddenly.
• Rainwater is acidic or leaches out alum from embankments into ponds, which makes pH in pond drops suddenly.
• Sudden drop in salinity (in brackish water farming)
• Reduction of dissolved oxygen in the water
• Reduction of alkalinity of water
• Rainwater and flood water can leach out alum, fertilizers, plant protection chemicals and toxic waste from fields, orchards or residential areas into rivers, canals and farming ponds.
2/ Farming species, ponds and cages can be lost or damaged due to:
• Rising water level can overflow and destroy embankments.
• Hurricanes, strong winds, big waves and flows can damage cages.
Viet Linh © 2016
In rainy season
In the shrimp ponds
Temporary process for safe brackish-water shrimp farming in areas affected by diseases in Vietnam