Fin rot and mouth decay can affect all aquatic fish and is easily identified.

Symptoms: The fins of infected fish look frayed and the edges of the fins may appear whitish. Many fish also have open wounds, especially at their fin base. The mucous membrane and eyes may look cloudy. In cases of mouth decay, fish often have a whitish, cotton wool-like covering and tissue damage on their mouth.

Cause: These infections are caused by bacteria. However, they are often signs that something else is amiss because they predominantly target fish that have a weakened immune system, are infested with skin and gill parasites, are kept in poor conditions or are generally stressed.

Remedial action: Apart from using a suitable medicine, it is vital to take measures to improve the environmental conditions, reduce stress and boost your fish’s health. These include carrying out a partial water change, cleaning the substrate, generally improving the water quality, providing a diet that improves the fish’s health and checking the fish stock (avoiding overstocking, taking social compatibility into account). The use of effective medicines that must be used in line with their instructions is advised.

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