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Lifecycle
This parasite has a life cycle that has four stages (figure 1). When the parasite is embedded in the skin of a fish (figure 2) it is called the trophont stage. Here it appears as a distinct white spot about 1-2mm across (around the size of a grain of salt). The parasite has bored inside the tissues of the fish (it is not on the skin’s surface) and is hemispherical in shape and covered with minute cilia (figure 3). The parasite rotates inside the capsule it makes in the fishes skin tissues and, it is said, this movement contributes to irritation the parasite causes and the fish often flick against hard surfaces in an attempt to knock this parasite off. In severe infections this flicking can cause additional damage to the fish’s skin. During this stage the parasite is feeding on the host building up its nutritional reserves ready to break out of the skin and start the next stage of the life cycle as a free living trophont. The free living trophont always exits the host at night and has one goal in life - to find a suitable substrate to encyst into the theront. A suitable substrate can be the sand at the bottom of the tank, detritus in a filter or even the surface of living rock. If it does not find a suitable place to form the cyst within 3-4 hours it usually dies.
After about a week as the tomont about 200 infective theronts will have formed within the tomont. The tomont then ruptures releasing the theronts back into the water column where they seek a host. The theronts are attracted by light and move up the water column looking for a susceptible host to infect. After release the theronts are infective for about 24 hours.
Readinds are :
pH 8.2
Nitrite 0
nitrate 20
Potassium 0
Magnessium 1200
Calcium 440
Strontium 12
KH 10
I did add some fish a couple of weeks ago and they were picked on straight away by 2 humbug damsels I had and quickly died. I returned the damsels to the local fish store.
What are the signs of whitespot and how do I try to cure it?
Any advice would be very welcome.