Very Good Evening and very happy to find place for myself in such an elite group. I have a question about mortality in Nursery for vannamei@ 2pcs/Lit and salinity about 7-10ppt.The animals feed and grow normal and good until 20-22 days,from there on we find mortality starting with 2-3 PC's and reach to thousands in next 4-5 days.Observation is the shell above the carapace still remains attached while the abdomen portion is molted and soft.We tried many combination of minerals but still we have this problem.I request experts advise on this forum.Kindly help me.Thank you