Gyrodactyliasis (skin worm)



A. Cause: Gyrodactylus spp.


B. Characteristics of pathogens:

- These small worms are ectoparasites, are obligate parasitic (fish as the only definitive host), worms multiply by breeding.

- Gyrodactylus sp. do not have eye points, and at the end of the head there are 2 bulges.

- Transmission of disease occurs horizontally, when worm children are born.

- This skin worm disease infects all types of freshwater fish.

- During his life he must infect fish as the definitive host, severe infections can kill 30-100% within just a few weeks; mainly as a result of secondary infections by bacteria and fungi.

- Several factors for the occurrence of infection explosion are fish species, malnutrition, high organic matter and fluctuations in water quality parameters, especially temperature.


C. Clinical Symptoms:

- Appetite in the fish will decrease, weak, the body of the fish is dark, growth becomes stunted, and excess mucus production.

- Inflammation of the skin with a reddish color at the site of attachment to the worm.

- Rubbing his body against the surrounding objects.


D. Diagnosis:

- Visual observation of behavior and clinical symptoms that arise

. Control:

- Water quality of aquaculture ponds needs to be considered.

- Giving immunostimulants to fish (for example adding vitamin C to feed) regularly during maintenance.

- Reducing the level of dissolved organic matter and / or increasing the frequency of replacing old water with new water.


- treatment can be done with several types of disinfectants, including:


 a. Immersion in kitchen salt solution at a concentration of 500-10,000 mg / liter (depending on the type and age of fish) for 24 hours;

b. Soaking in a solution of Potassium Permanganate (PK) at a dose of 4 mg / liter for 12 hours.