Fish caries
There are signs of illness that fish can't control their position in the water. Sometimes they can only rise from the bottom of the water with their best efforts. Sometimes they can't leave the water surface and even turn upside down on the water.
Invasive fish
If the problem is not caused by a disease, the problem may be due to malfunction of the surimi. Such problems are usually limited to deep-body fish, especially carp. Scalefish seems particularly vulnerable.
Recommended treatment
There is no effective treatment for this condition. Since the disease is caused by cold water, a slight increase in temperature plus moderate saline solution can often alleviate the condition. Feeding leeches or bugs to improve digestion can help.
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