Control and Prevention of Ciliates
2026-06-05
Ciliates are one of the most serious diseases in the culture of Pacific white shrimp; once an outbreak occurs, they directly impair the shrimp’s feeding, molting, and growth. Ciliates are protozoa, with common species including *Epistylis*, *Vorticella*, *Uronema*, and *Didinium*, all belonging to the order Peritrichida and the suborder Sedentaria.
Environment conducive to the overgrowth of ciliates:
Ciliates survive by ingesting organic detritus, bacteria, and phytoplankton from the water. During overcast or rainy weather, when bottom sediments are stirred up, the aquatic environment often exhibits a single‑dominant algal community and severe organic pollution. The higher the organic matter and bacterial load, the more abundant ciliates become. Furthermore, temperature is another critical environmental factor influencing the growth and reproduction of ciliates; different temperature regimes support distinct ciliate assemblages.
They can be classified into three types: low-temperature, medium-temperature, and high-temperature.
1: Those that survive at 14–17°C are classified as the early-summer low-temperature type.
2: Temperatures of 19–26°C and 21–27°C are classified as the moderate-temperature type of early autumn.
3: Temperatures of 29–30°C are characteristic of midsummer heat.
Harm caused by ciliates:
1. It can impair the normal activity of shrimp, slow down their feeding rate, and reduce their feed intake, thereby leading to stunted growth.
2. It impairs the respiration of shrimp and leads to failed molting. Once infected with ciliates, shrimp experience respiratory distress, fail to molt, develop molting difficulties, and cease growth. In rare cases where molting does occur, the ciliate‑infested areas may undergo calcification of the shell, causing the old and new shells to adhere and resulting in injury; secondary bacterial infections can then lead to mortality.
3. Declining health and reduced immunity make shrimp more susceptible to bacterial infections. After feed reductions, it is often difficult to detect the issue promptly, leading to excess feed that degrades water quality, weakens shrimp health, lowers their immune defenses, and leaves them highly vulnerable to bacterial pathogens.
How to determine whether ciliates are present:
1. Inspect the aquatic vegetation, wooden stakes, and ropes around the pond for the presence of filamentous or hairy growths.
2. When touching the shrimp’s body, the surface mucus increases, feeling slimy; in some cases, there is also a rough, grainy texture.
3. Monitor dissolved oxygen levels in the pond. If oxygen is adequate but shrimp still exhibit surface‑floating behavior, it may be due to ciliate parasites on the gill filaments, impairing respiration.
4. The feed platform is slimy, especially on the ropes, with visible deposits; if lifting the platform feels unusually heavy, it could be ciliates.
Ciliate control methods:
1. Water Quality Management: In aquaculture, water quality is of paramount importance—“to raise shrimp, first cultivate the water.” It is essential to maintain a balanced aquatic environment by keeping parameters such as pH, ammonia nitrogen, nitrite, and dissolved oxygen within appropriate ranges, thereby preventing deterioration of both water and bottom conditions and safeguarding the growth habitat of ciliates.
Treatment plan: Use 2 mu per bag of concentrated Bacillus subtilis and 2 mu per bag of concentrated photosynthetic bacterial powder, combined promptly with 2 mu per bottle of live lactic acid bacteria to regulate water quality.
2. Regular Bottom-Conditioning: As the culture progresses, organic debris in the pond increases, and the pond bottom gradually accumulates shrimp feces, leftover feed, and dead algae. Therefore, a bottom-conditioning agent should be applied to improve the substrate, promoting the decomposition of organic matter, uneaten feed, and fecal waste at the bottom, raising the redox potential of the sediment, and thereby disrupting the growth and reproduction environment of ciliates.
Treatment plan: Alternate between using Strong‑Effect Bottom‑Improving Agent at 2 mu/kg and Peroxide Bottom‑Cleaner at 30 mu per bucket.
Ciliate Outbreak Treatment Protocol:
Dilute one bottle of Xianchongjing (4 mu per meter) in water and apply it externally using an aerator, avoiding the molting period. The day after insecticidal treatment, use either Zhongren Gold Iodine at a rate of one bottle per 2 mu of water (follow with bacterial inoculation after 12 hours) or Tangliang at a rate of one packet per 2 mu of water (follow with bacterial inoculation after 6 hours) for disinfection, to prevent bacterial infections that could lead to secondary diseases.
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