A. Causes: Nerocilla orbiguyi, Alitropus typus, etc.


B. Characteristics of pathogens:

- Isopod is a blood feeder "parasite" which is relatively large (10-50 mm), the body part consists of several segments with a pair of eyes.

- This type of parasite will infect seeds, enlarge the parent, and almost all types of fish are susceptible to parasitic infections, especially in fish that have scales.

- Parasites attach to the surface of the fish's body, inside the mouth, nostrils or gill cover.

- Serious cases generally occur in fish culture activities in floating net cages, both in freshwater ecosystems and in seawater.

Transmission occurs horizontally, and the trigger is partly due to high density aquaculture conditions.

- Fish will grow slowly, often resulting in death due to anemia or secondary infection by bacteria.



C. Clinical Symptoms:

- There will be a wound and bleeding at the bite site, visually this type of parasite will appear to stick to the fish's body, especially under scales or at the base of the fin.

- Lost fish balance, weakness, and decreased appetite.

- Necrosa in gill tissue or fish skin.



D. Diagnosis:

- By sight by the eyes, there will be visible parasites that attach to the fish's body.



E. Control:

- Parasites in fish are released in a limited container with the active ingredient Temephos (Abate) at a dose of 1 mg / liter (aquarium), after the parasite has fallen out, the fish is then transferred to another container to be treated with disinfectant to prevent secondary infection by bacteria in the parasite bite ;

- Using spotlight at night to collect the parasite in one location, then lift it using a net.