Scientists use 2 methods to immunize fish against "white-spot" disease

08/29/2010 | Los Angeles Times (tiered subscription model)

Researchers at the Department of Agriculture's Agricultural Research Service have developed two methods to vaccinate fish against Ichthyophthirius multifiliis or Ich, a disease marked by the presence of white spots on the fish's skin. They were able to induce immunity in channel catfish by injecting live protozoan parasites, which infect the fish's skin, and bathing the catfish in dead parasites killed with high-frequency sound waves. However, they said they have to develop a process that would allow them to produce the parasite in large quantities.

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