Types of Fish Disease
Fish ailments can be separated into 4 general types including bacterial infections, fungal infections, parasitic or protozoan infections, and physical ailments and wounds.
Bacterial Diseases: Bacterial diseases are usually characterized by red streaks or spots and/or swelling of the abdomen or eye. These are best treated by antibiotics such as penicillin, amoxicillin, or erythromycin.
Fungal Diseases: Comon fungal infections often look like gray or white fluffy patches.
Parasitic Diseases: The most common parasitic disease called "Ich" can be treated most effectively with copper or malachite green in the right dosage. Most treatments will have copper as an ingredient. Many water treatments like "Aquari-Sol" will also contain copper as an ingredient. If the treatment you use is an anti-biotic or copper based, remember to remove all carbon from the filtration system.
Physical Ailments: Physical Ailments are often the result of the environment. Poor quality water conditions can lead to fish gasping, not eating, jumping out of the tank, and more. Tank mate problems can result in nipped fins and bite wounds.
http://animal-world.com/encyclo/fresh/information/Diseases.htm
The penicillins, including penicillin, amoxicillin, and ampicillin, are most effective against gram-positive bacteria such as Streptococcusspecies; therefore, for the same reasons as those given above, these antibiotics are not a good first choice for most bacterial infections in fish. None of the penicillins are FDA-approved for use in food fish.
Use of Antibiotics in Ornamental Fish Aquaculture
details in;
https://edis.ifas.ufl.edu/fa084
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