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Symptoms And Treatment For Disease In Your Aquarium
Fish lice, fungus, gill flukes and hole-in-the-head are just four of the many diseases or problems that your fish may suffer during their stay in your tank.
This article shows you what to look for and how to combat the disease itself.
Fish Lice
Symptoms: Behavior wise you will see the fish trying to scratch itself against whatever it can find. You will also see round shaped transparent parasites stuck to the fishes body. Evidence of locations the parasite has visited previously will show as red patches or areas that are scarred.
Reason: These parasites, that have eight legs, are lice (Argulus) that attach themselves by suckers, break the skin and feed on the fish. Eggs are laid away from the fish. Some say that they are often mistaken for algae but if you look closely enough you'll see what they are if they are adult as they appear a green color but the young may not be so obvious.
Treatment: The adult parasites can be removed by tweezers once the fish has been removed from the aquarium. Use an antiseptic as treatment for the areas affected. Organophosphates can be used as a treatment for the whole aquarium to cope with the newly born and young parasite. However chemicals such as this (Dimlin or difluorobenzene) are banned in lots of countries.
I have noted that Parazin P, a medication suitable for treating crustacean infestations, has been proposed and takes several weeks to take effect as it is based on the life cycle of the parasite.
I have also read of a treatment whereby the fish is rubbed with a piece of kitchen roll paper on the parasite affected area, the fish is dipped in water (at the same temperature of the main tank) and all the parasites in that area leave the fish! Apparently the parasites do not like dry conditions, hence the use of the dry paper roll. No harm can come by doing this so give it a go?
Fungus
Symptoms: The areas of the body that are affected are those where the mucous layer that protects the skin has been damaged. You will see cotton wool like material attached to the fish or the whole appearance of the skin may seem unclean. This is why this disease is often referred to as the cotton wool disease. Fungus types are typically Saprolegnia, Achlya, Leptomitus and Pythium.
Reason: This is a secondary infection as it often occurs after an initial wound has happened or where a parasite has been active or after the fish has suffered from white spot. Could also be due to bad water quality.
Treatment: You can use a proprietary fungicide such as phenoxyethanol to treat the individual fish in a hospital/quarantine tank but try to determine the cause of the outbreak and put corrective measures in place, otherwise it may well break out again. Salt baths are another alternative or the use of Gentian Violet topically on the affected area.
Gill Flukes (Dactylogyrus)
Symptoms: To relieve itching the fish will be seen forcing itself up against anything it can rub on. It may be breathing fast or gulping for oxygen at the surface. As the disease takes hold the fish will become lethargic and try to isolate itself in a corner or stay on the bottom of the tank. One particular gill may seem permanently open or closed, gills may appear swollen and it will not be eating much.
Reason: A worm like parasite up to 2 mm long infests the gills of the fish and reproduces there. It has hooks on its body to dig into the flesh which causes damage and possible bacterial infection. But the main effect is to reduce the fishes ability to breath and get in enough oxygen, eventually leading to death.
Treatment: This is an infectious disease so treatment of all fish is recommended. As the parasites eggs are quite hardy, repeated treatments over a few weeks will be needed to kill off the newly hatched worms. Fluke tabs are no longer recommended.
Praziquantel (Droncit (USA) or Drontal (UK) are preferred as they are safer for the fish. Other UK treatments include Paragon (for mild infections and safe with shrimps and snails or Sterazin (for serious infections but not safe with shrimps and snails. A follow up bacterial treatment is probably advisable to counteract any secondary infection caused by the parasite.
Hole in the head (Hexamitiasis)
Symptoms: This disease has an effect on the insides of the fish (intestines) and the skin (under it) so you might see pits in its head and its faeces will appear to be thready and white. Discus fish are particularly susceptible. The fish may swim backwards, it might look for shelter with its head facing downwards and the usual color will become darker.
Reason: A parasite called Hexamita is the culprit. It lives in the intestines and can become a problem when fish become stressed and/or weak due to poor environmental conditions.
Treatment: Metronidazole at about 500 mg per 10 gallons is the normal dosage. Dissolve the medication in hot water first. Several treatments may be needed over two weeks with 50 percent water changes carried out before each treatment. I have noted that some folk add Malachite Green to act on secondary infections.
Putting medication in the fishes food is a good idea because the disease has an effect on the fishes insides. 250mg (0.25g) of Metronidazole in 25g of food will do the trick.
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