Bacterial Fin / Tail Rot / Pseudomoniasis




A. Cause: Pseudomonas spp.


B. Characteristics of pathogens:

- Bacteria belong to gram negative and non-spore bacteria. The bacteria are aerobic, with a size of 3 µm x 0.5 µm, motile, producing fluorescent pigments, and bacteria breeding in soil and water;

- Pseudomoniasis is a bacterial disease that often occurs in all ages and types of fish, both freshwater and seawater;

- Pseudomonas is a dangerous disease agent, especially in freshwater fish and can result in high mortality because the disease is contagious quickly if the water conditions permit;

- The spread of pseudomoniasis is through direct contact with fish affected by the disease or with a polluted environment;

- Attack of this disease can occur if the fish is stressed or weak due to hunger, food is not suitable, cold, or water conditions are not good.




C. Clinical Symptoms:

- Fish become weak, movements become slow, fish breathe gasping on the surface of the water;

- Fish gills are pale and the color of the body turns dark black;

- there are red spots on the outside of the fish's body and damage to the fins, gills and skin;

- Excessive mucus on the surface of the fish's body, then bleeding;

- On the fin and tail fall (rot);

- bleeding occurs, the fish's stomach becomes bloated or known as dropsy.




D. Diagnosis:

- Isolation and identification of bacteria through bio-chemical tests.




E. Control:

- Cultivation facilities are disinfected before and during fish rearing;

- Carrying out immunostimulants (for example adding vitamin C to feed) routinely during maintenance;

- The occurrence of stress in fish needs to be avoided (physical, chemical, biological);

- Water quality needs to be repaired as a whole, especially reducing the levels of dissolved organic matter and / or increasing the frequency of replacing old water replaced with new water;

- Fish health and the environment need to be managed in an integrated manner (fish, environment and pathogens);

- Reduce feeding and the amount of fish in the pond;

- Fish soaked in a solution of PK (Potassium Permanganate) 20 mg / liter for 30 minutes.