US SIS launches new prawn broodstock for India..

https://www.thehindubusinessline.com/economy/agri-business/us-firm-launches-new-shrimp-broodstock-for-india/article32952074.ece

The shrimp nephrocomplex serves as a major portal of pathogen entry – involved when molting and induced salinity conditions..

Basically a drop in salinity, from rain say, can allow pathogen entry if whitespot and vibrio.

When molting shrimp are also susceptible…virus carrying crab, if in system, can also attack shrimp when molting