The aquarium hobby has seen a remarkable surge in popularity over the past few decades, leading to an increased interest in various aquatic species, particularly freshwater shrimp. Among these species, Neocaridina, commonly known as cherry shrimp, has garnered a significant following. However, the rise in popularity also brings challenges, particularly concerning shrimp health. One of the most common issues faced by shrimp keepers is the infestation of parasites, particularly Scutariella Japonica. This guide aims to provide a thorough understanding of this parasite, its identification, treatment options, and preventive measures to help shrimp enthusiasts maintain a healthy aquarium environment.

What Is Scutariella Japonica

Scutariella Japonica is a type of flatworm classified under the phylum Plathelmintae and the class Trematoda. These parasites are typically found in freshwater environments, attaching themselves to the gills and body of their shrimp hosts. They are often described as "sit-on" worms, as they utilize the shrimp as a substrate for their own survival without significantly harming them in moderate numbers. However, heavy infestations can lead to health complications for the shrimp, making it essential for hobbyists to understand how to recognize and manage this parasite.

Life Cycle of Scutarella Japonica

The life cycle of Scutariella Japonica is fascinating and complex. The adult worms are typically found adhering to the gills or rostrum of their shrimp hosts. They reproduce by laying eggs, which are often visible as small white dots located in rows behind the shrimp’s head in the gill chamber.

When the shrimp molts, the eggs are released into the water, where they can hatch and seek new hosts. This lifecycle allows the parasite to spread quickly, especially in aquariums where shrimp are frequently molting. Understanding this life cycle is crucial for effectively treating and preventing infestations.

Identifying Scutariella Japonica
To identify *Scutariella Japonica*, look for small, white, branch-like appendages measuring 1 to 2 millimeters on the shrimp’s head or rostrum. These parasitic flatworms, classified as Plathelmintae/Tubellaria/Temnocephalidae/Scutarielloidea, typically attach themselves between the eyes or on the rostrum, with rare instances of being found on legs or other body parts.

Another telltale sign is the presence of eggs, which are laid in rows behind the head within the gill chamber, appearing as small white dots. During molting, these eggs can hatch and infect other shrimp, making timely identification crucial.

 Is Scutariella Japonica Dangerous?
The short answer, No. Generally, the relationship between shrimp and Japonica is a symbiotic one. While *Scutariella Japonica* is generally harmless and does not typically kill shrimp, a heavy infestation can interfere with the shrimp's breathing and mobility. A heavy infestation is generally a sign of poor water quality. This can lead to health issues and, in severe cases, mortality. In this case, the treatment shouldn't be the parasite, but addressing the water quality issues. The parasites adapt well, often infecting healthy shrimp as well as those already weakened by stress or poor water conditions.

Here is an amazing video going into more depth from Shrimply Explained on YouTube:

Treatment Options for Scutariella Japonica
If you feel like you MUST treat and/or it has reached pandemic levels, you can use the following steps to treat and remove Scutariella Japonica.

1. **Freshwater Aquarium Salt**: A common method involves using freshwater aquarium salt. Add 1 tablespoon to a cup of aquarium water, dissolve it, and dip the infected shrimp for 30-60 seconds. This method may require multiple dips, as it doesn’t eliminate the eggs.

2. **Seachem ParaGuard**: This treatment can be administered to the entire tank and is known to be safe for shrimp and shrimplets. The recommended dosage is 5 mL for every 40 liters (10 gallons), repeated daily for about a week.

3. **Praziquantel**: Although not specifically designed for aquariums, Praziquantel is effective against parasitic worm infections. Administer at a dose of 2.5 mg per liter (10 mg per gallon) and repeat after 2-3 weeks to target newly hatched eggs.

4. **Fenbendazole**: Commonly used for deworming, Fenbendazole should be applied with caution if snails are present, as it can be harmful to them. Use 0.1g per 10 gallons, repeating the dose in 2-3 weeks.

5. **Internal Parasite Clear and Other Treatments**: Products like Benibachi Planaria Zero and No Planaria can also be effective. Use half the recommended dose for 3 days, ensuring a 30-40% water change afterward.

Removing Molts
Parasite eggs often cling to shrimp molts, so it’s essential to remove them promptly for at least 2-3 weeks post-treatment. Regularly inspect your tank, especially after water changes, which can trigger molting.


Conclusion
Understanding *Scutariella Japonica* is key to maintaining a healthy shrimp aquarium. While treatments are available, prevention through water management is crucial for the longevity of your shrimp colony. Always remember to monitor water quality and the overall health of your aquatic environment to keep these beautiful creatures thriving.

Sources:

https://aquariumbreeder.com/shrimp-disease-scutariella-japonica-treatment/

https://www.researchgate.net/figure/Scutariella-japonica-adults-white-arrow-saddle-in-Neocaridina-davidi-rostrum_fig2_327020115