How do I prevent disease in my freshwater pearl mussels after surgery?

After implanting the nucleus, the main losses come from poor surgery, stress and bad water, so prevention is mostly about technique and water quality rather than medicine. Give the mussels rest and recovery care after the operation, keep them in clean, good quality pond water with natural plankton food, and hang them at the right depth in nylon bag nets so they stay healthy. Crowding, dirty water and rough handling raise mortality. Check the nets regularly and remove dead mussels promptly so they do not foul the water. There is no simple medicine that fixes poor surgery, so the real fix is proper training and clean water. If you see unusual mass mortality, get guidance from your training institute or district Fisheries officer rather than dosing chemicals blindly.