White Spot On Freshwater Aquarium Fish
Crowding enables nasty germs to get a foothold. That is why feeder fish (fish that is used to feed carnivorous fish) always carry bugs because they are shipped in big numbers in small space. There was one time I introduced some feeder Sarasa Goldfish and the whole tank got ich.

Fish in 100% cleaned tank with 100% new water can get ich more easily. The tank environment must be cultivated patiently until it reaches biologically steady state. Fish in such tank will hardly get disease because they are not under stress.

Ich is the short name of Ichthyophthirius multifiliis. They burrow under the fishes' skin and suck fish juices. The fish tries to protect itself by growing a covering over the invaders – hence the characteristic white spot. The tail and fin will rot and the fish dies if it is not treated. It is treated by salt purchased from aquarium shop. Do not use table salt because it may have contain unnatural additives. Salt dip kills the germ and helps fish build protective slime coat against germs. The protective slime coat cannot be created in low temperature but that is not a concern in hot countries unless you purposely put ice into your tank. I actually saved one white-spotted Goldfish by salt-dipping it. Take note that do not throw the fish into a salt dip with high salinity but to start with low concentration and increase it slowly. Do not use chemical (for example blue drop) as it does not do good to the environment in the tank. Use it only if salt is not helping. Good quality water and minimal stress helps fishes ward off ich and other infestations without medications. Example of stress: fright, too much light, no hiding places, bullies, crowding, ammonia, nitrite, insufficient aeration or filtration, overfeeding, water too hard or too soft, too much fresh tap water.
Posted: 2007-02-04 by Ong Seng Aun.
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