author(s)
Sweta Pradhan, SS Dey, S Samantaray, Nandini Padhi, PK Tiwari and Shailesh Saurabh

abstract
The study was conducted to control leech infestation in the freshwater pearl mussel by applying different concentration of chemicals. Among these chemicals, it was observed that efficacy of ivermectin (0.15 ppm) and malachite green (5 ppm) were significantly effective (P< 0.05) in reducing the leech infestation from the body cavity and shell surface followed by deltamethrin (0.30 ppm) as compared to other treatments. Further the survivability of the mussel was recorded for the period of 10 days and 100% survivability was found in case of potassium permanganate, malachite green, deltamethrin and albendazole as compared to ivermectin (30%) and other treatments. However, the efficacy of malachite green in killing the leech from the mussel body was significantly better (P< 0.05) than deltamethrin. To conclude it was found that malachite green @ 5ppm is the most effective to kill leeches with good survivability of mussel and useful for health management of mussel.