HANDLING HARMFUL FUNGI AND BACTERIAThái Nam Việt
Thorough treatment of harmful fungi and bacteria in the ponds of shrimp seed and mature shrimp
In hatcheries and commercial shrimp farming, harmful fungi and bacteria are the causes of heavy losses in the crop. Particularly in perennial ponds, gerbera fungus (dog’s foot fungus), foot-sticking fungus in seed production, and harmful bacteria causing disease in cultured shrimp.
– Money mushroom, also known as dog’s foot fungus, according to the folk name of the breeder, is actually a lichen, not just a fungus. Lichens are a symbiosis between fungal hyphae and photosynthetic organisms (algae or photosynthetic bacteria). The gerbera mushroom has a strong fishy smell and often clings to the canvas, soil, rocks, feeding sticks, and tools in the pond. They often appear in areas with high salinity, in perennial ponds, and in ponds that are not well-improved. Along with an excess of organic matter, algae blooms or dead algae cause the size of fungi to increase rapidly.
– Mushrooms that cause shrimp paw stickiness usually appear at the Zoea 2 stage. When the water supplied to the nursery tank has not been properly treated, feeding dried algae too early or controlling the number of algae fed tightly leads to an excess of organic matter. conditions for fungal growth.
In addition to the water environment and pond bottom mud, the places where the fungus attaches are also a habitat for harmful bacteria that cause diseases for farmed shrimp.
– Mushrooms have a fishy smell that is very attractive to shrimp, so shrimp easily eat these mushrooms. When entering the intestinal tract, the fungus will produce toxins that cause intestinal diseases, causing shrimp to stop eating, from which their body shells become stunted and they may die.
– In the Zoea 2 stage, when the fungus causes the foot to stick, the shrimp larvae will not be able to move to catch the prey, unable to switch stages leading to death.
– When shrimp eat fungi with resident bacteria, these harmful bacteria will be opportunistic pathogens when shrimp have intestinal diseases, causing heavy damage to the culture.
–For ponds that have been infected with Gerbera, it is imperative that the stage of fungicidal and fungal sporulation be focused on and treated thoroughly before stocking shrimp, combined with the use of microbiological preparations. The biological treatment of water inhibits harmful bacteria and adds beneficial bacteria to the environment.
For ponds with shrimp
- Special care must be taken when using mechanical measures such as scrubbing or bleaching individual fungi, as this may inadvertently cause the fungal spores to spread more strongly and the individual fungi when scrubbed off. will produce toxins when eaten by shrimp.
- Reduce and control the amount of feed, and supplement nutrients to support the shrimp’s digestive system.
- Raising the turbidity or water level to reduce light, prevents the photosynthesis of the fungus and will cause the fungus to die.
- Strengthen the water fan, and reduce air.
- Avoid feeding near shore
- Biological measures: adding microbial products to inhibit harmful fungi and bacteria.
For fungi causing larval foot adhesions at the stage of Zoea 2
- Carefully treat the water supply to the nursery tank.
- Control feed quality and feed intake to limit excess organic matter.
- Strictly manage the water environment in the nursery tank.
- Periodic bottom siphon
- Biological measures: using microbial products to treat the water supply and the water environment during the incubation process to inhibit harmful bacteria and supplement beneficial bacteria to treat the excess organic matter in the tank.
PROPOSED SOLUTION FROM THAI NAM VIET
Harmful fungi and bacteria cause great damage to the crop and are difficult to handle if infected. Early detection of the fungus in the pond will make the treatment more gentle and effective.
Using probiotics to control fungi and bacteria is highly effective and does not adversely affect the aquatic environment, ensuring the health and development of larvae and cultured shrimp, and limiting losses to aquatic life. farming service.