In addition to the problems of diseases and breeding animals, toxic gas is still the concern of farmers in each farming season. Because they are the cause of slow growth, stunting, and even mass death of shrimp. However, this situation is very common, leading to great impacts and losses to farmers. So where do they come from and what is the solution to the above problem. Let’s find out with BioFix Fresh
1. Origin of formation
Toxic gases NH3 and NO2 have a close relationship with each other. Because NO2 toxic gas in shrimp ponds originates from NH4+/NH3 through stage 1 of the nitrification process, it turns to NO2. Or NO2 already exists in the water supply.
a) NH3 gas
Produced mainly from protein components found in aquatic feed. Because the excess food will dissolve in water and decompose into NH3 after some time. If the nitrogen content exceeds the allowable threshold, it will cause serious water pollution.
Besides, shrimp only absorb about 25% of the feed, the rest will be converted into excreta into the water. This shows that the more waste shrimp eat, the more waste they excrete. Which is also the cause of toxic gas production in the pond.
In addition, shrimp carcasses, algae … after death will also decompose and create a significant amount of toxic gas.
b) NO2 gas
The main reason leading to the production of NO2 gas is because the toxic NO3 gas in the pond is broken down into NO2. Or the dissolved oxygen content in the pond is low. Causing the slow nitrification cycle to increase NO2 gas.
In addition, the weather is also the cause of toxic nitrogen dioxide gas, because rainwater contains a lot of acids, which deeply reduces the pH value, low salinity, promotes high NO2 toxicity.
2. Impact on shrimp ponds
NH3 and NO2 gas in shrimp ponds is a concern of farmers because it brings several harmful effects such as:
– Disorders of physiological processes as well as neurological inhibition in shrimp: as mentioned above, when excreting, shrimp will excrete NH3. If the amount of NH3 in the environment is higher, it will affect the osmotic mechanism of shrimp. Moreover, when NH3 tends to diffuse back into the blood, it will inactivate some enzymes as well as prevent the elimination of CO2 in the blood, changing blood composition.
– Increased susceptibility in shrimp to the environment due to high toxic content, reduced disease resistance, picky eating as well as growth in shrimp. Especially, NO2 is high, it will combine with Hemocyanin in the blood of shrimp. Making it unable to transport oxygen in the blood, causing shrimp to suffocate. When shrimp are chronically asphyxiated, they will be weak and will suffer from diseases such as white feces disease, hepatopancreatic disease on shrimp, white spot, muscle necrosis, … or die from environmental shock.
– Other harmful effects that toxic gases NO2/NH3 commonly cause are disturbances of osmotic pressure balance with signs such as: molting without a hard shell, slow growth of shrimp, damaged gills, and muscle edema.
Some other manifestations: floating head, jumping out of the water…
Currently, there are many solutions to the above problem: Apply lime around the pond to limit environmental changes in the pond when it rains heavily, control the amount of food for shrimp… However, farmers can use this method. BioFix AQT microbiological product to solve the above problem. Because:
The ingredients in the product are microbial strains: Bacillus sp, Bacillus subtilis… and Active Enzymes: Protease, Amylase, Lipase… help promote the decomposition of waste and leftovers in the pond. Thereby, controlling the amount of toxic gas generated in the pond from leftovers and excreta.
In addition, BioFix AQT also helps to supplement nutrients to support the digestion of seafood, help strengthen resistance and reduce the influence of microorganisms or toxins.