How erly mortality syndrome (EMS) came to Mexico is somewhat of a mystery, Donald Lightner, shrimp pathologist from the University of Arizona told IntraFish newspaper Fish Farming International in an exclusive interview, although he thinks it may have had something to do with post-larvae (PL) sources.

“There are no records of legal introduction of broodstock -- I know the guy that writes the permits -- so it had to have been some other way,” he said.

Several hatcheries were producing PLs for stocking at the time and [the spread of EMS] seemed to follow some of the dominant hatcheries," Lightner said.