{"id":65310,"date":"2018-07-30T08:38:23","date_gmt":"2018-07-30T06:38:23","guid":{"rendered":"https:\/\/koiquestion.com\/white-dot-is-not-white"},"modified":"2018-07-30T08:38:23","modified_gmt":"2018-07-30T06:38:23","slug":"white-dot-is-not-white","status":"publish","type":"post","link":"https:\/\/koiquestion.com\/en\/white-dot-is-not-white","title":{"rendered":"White dot is not white"},"content":{"rendered":"
Dit artikel is deel [part not set]<\/font> van 37 in de serie Parasieten<\/a><\/div>

White Spot (Ichthyophthirius multifiliis)<\/strong><\/h3>\n

This parasite seems to be the most widespread parasite in the world on fish. White spot can multiply between 4-32 degrees Celsius. The annoying thing about White Spot is that they are massively present at outbreaks, spread all over the body. This is in contrast to other parasites. <\/p>\n

Aquarium keepers with tropical or saltwater fish also know this parasite.
\nWhite Dot under the microscope is dark brown to black in color. A white curved stripe in the nucleus is recognizable, provided that the parasite is almost fully grown. They are not dimensionally stable and can maneuver through narrow corridors. <\/p>\n

\"White<\/a>
White Dot under the microscope: Top left 250x, top right 40x, bottom 100x<\/figcaption><\/figure>\n

Why is White Dot called that? This is because the fish all get white dots as symptoms. A young parasite nestles in the mucous membrane of a fish and then grows into an adult White Spot. At the place where the parasite has encapsulated itself, a white dot forms in the mucus layer. <\/p>\n

To reproduce, it falls off the fish and forms a cyst. An average of 2,000 offspring develop in the cyst. They are called theronts. After leaving the cyst, these offspring look for a new host. Once they land on a fish, they grow until they are adults… And so the circle is complete! <\/p>\n

However, beware, not every fish gets the characteristic white dots on the skin. Or only at a very late stage of the outbreak. Sometimes you don’t see the parasite on the skin, but you can see it on the swab of the mucus layer. Under the microscope you will probably see many of the parasites! <\/p>\n

Cycle
\n<\/strong>
\nThe total cycle goes from theront in the water, to wandering parasite on the fish, to encapsulated in the skin, to cyst outside the fish. The total duration of the cycle depends on the water temperature. This can be four days at high temperatures ( > 21 \u2070C) to twenty days at winter temperatures ( < 8 \u2070C). <\/p>\n