Owning an arowana takes a lot of responsibility, from feeding to helping them keep their balance to taking care of them and treating them when they are sick. No matter how we take care of our fish, it remains possible for them to become sick one time of another, just like us. Other than that, it’s very easy to keep an arowana healthy at home.
Below are some diseases that may affect your arowana.
1. Warped Scales
Also known as cone scales, warped scales affect young arowanas more easily than adults. This condition is caused by immediate temperature change in the aquarium water and poor quality of water. This disease will start with just few scales warping with congested roots. If this is not attended immediately, the scales tend to bend and swell. When the scales raise, this will minimize the capability of the fish to protect itself from pathogen invasions. The scales will drop off and expose a certain area of its body increasing the susceptibility of bacterial attack. Then this will lead to ulceration and eventually causes death.
To stop the condition from getting worse, add in one kilo of salt to every 100 liter of aquarium water. Maintain the temperature at 32 to 34 degrees. Every three days or so, change about 20% of the water. Before you add in new water, make sure to heat up the water. It also makes sense to add antibiotic to the water if the affected area seems huge enough, to prevent infections.
2. Water Mycosis
The fungus stays in the wound of your arowana. It is light gray in color. Water mycosis is caused by fungal hyphae that cover the wound. This causes instability to the movement of the fish as it swims and rubs its body against parts of the tank to try and stop the itch. If this condition continues, it could be fatal to your arowana as it tends to lose it’s appetite as well as get secondary infections caused by bacteria in the water.
To treat water mycosis, you need to add in salt to the aquarium water with one percent consistency. Put disinfectant to the wound or you can add methyl red (4-5 drops) in every 100 liters of water at 5 percent consistency. For about 3 minutes, add in potassium chromatic solution of 1/30000 unit to the water.
Young arowanas are the ones who are usually affected by this disease. This is usually caused by either decaying food which has been left in the water for too long or if the fish had accidentally swallowed something sharp (like a fish bones or prawn head pincer) which could have hurt its internal organs. This would lead to vibrion infection and ascites. This infection will cause stomach flatulence and swollen anal region. The arowana will tend to have problems balancing itself with its head pointing down most of the time.
Treating ascites includes administration of sulphonamide or antibiotic. The water also needs to be changed and temperature raised by 2-3 degrees to give it a chance to recover. But I have to say, the chances of recovery is slim when this condition hits.