Loose feces, undigested feces and tail pus (tail rot) can occur at every stage of the crop, especially after 20 days of age. They leave shrimp stunted and slow-growing, and if the problem drags on it can lead to white feces disease.
What causes tail pus
Tail pus has many causes:
- Vibrio bacteria.
- Parasites.
- A poor pond environment.
- Unusual weather changes at the turn of the season.
- Feeding much more than the shrimp normally need.
Prevention during the crop
During the crop, farmers should prepare incoming water thoroughly, with chlorine and potassium permanganate at the full dose; stabilise water quality with probiotics; support liver (hepatopancreas) function in the early period after stocking; pay close attention to gut health and add quality digestive probiotics throughout the crop; manage feed well and avoid overfeeding; disinfect periodically and then re-apply probiotics; and take shrimp samples to the nearest lab for regular testing.
When shrimp have tail pus
If shrimp have tail pus, reduce the feed and carry out the following steps:
- First 2 feedings: mix AQUA PRAZI into the feed.
- 3rd feeding: mix in BIOMAX + HERB GUARD.
- 4th feeding: mix in PRO GUT + AQUAMOS.
- Then, in the evening (for shrimp at the 40-day stage), disinfect the water with VIBRIO CLEAR (1–1.5 kg/1,000 m3) or POWER GLUTA (1 litre/2,000 m3).
- The next day: re-apply probiotics with SOILMAX to restore the beneficial microbes in the pond. At the same time, give digestive probiotics at a high dose to help restore gut health, and check the feeding trays often to monitor shrimp health.
- Every day: keep 1 morning feeding with PRO SUR at 3 g/kg feed.
Tail pus is currently hard to clear up completely; it can only be eased. Farmers should therefore repeat this protocol after 1 week.
English text adapted from Than Vuong's original Vietnamese infographic.
