Sea cucumber suffering from blubber disease in the low temperature (less than 8°C) during the period from January to March each year is the peak of the disease. Winter ginseng incubation period and ginseng cultivation period are all found, which can lead to higher mortality. When the water temperature rises above l4°C, the condition is reduced or disappeared.
Symptoms of the disease are similar to those of the "Qiao Shen Yu Skin Syndrome." There are many plaques on the abdomen and back of the diseased ginseng. Serious or even the entire tissue rots, exposing deep tissue. A large number of flatworms inhabit the subcutaneous tissue, causing tissue ulceration and damage. Overwintering larvae have decreased adhesion, and they easily slide from the base of attachment to the bottom of the pool. After anatomy, it was found that most of the affected individuals had discharged their organs and lost their ability to feed.
The detection was found to be a flatworm infection; it is generally present at the same time as a bacterial infection, and the flatworms are present on diseased bodies after bacterial infection, exacerbating the condition of sea cucumbers and accelerating the death of sea cucumbers. Therefore, it was initially determined that the flatworm is also one of the causative agents of the "fish taint syndrome" and is a secondary infection. Flatworms are slender, linear, and of varying lengths, with polymorphisms. So far, only the sea cucumber has parasitic worms, so it is called as sea cucumber flatworm.
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