Ballast water discharging. It has been estimated that world-wide, over 3,000 species are transported in ballast water every day. Photo: CSIRO (CC 3.0)


The U.S. Coast Guard has informed several manufacturers of ballast management systems that use ultraviolet technology that their methods do not meet U.S. regulatory standards.

These ultraviolet-based systems render the marine critters “unable to colonize”, but they don’t zap ’em dead – and according to the regs. dead means dead, not non-reproductive.


Lionfish – an invasive specie. Photo by Alexander Vasenin (CC 3.0)


MarineLog:When it comes to U.S. regulations on ballast water management systems, it seems that dead means “dead” and not merely “unable to colonize.”

The Coast Guard’s Marine Safety Center has informed four manufacturers of ballast water management systems (BWMS) that are based on ultraviolet technology that the Most Probable Number (MPN) test method is not considered an equivalent alternative to the test method prescribed in the Coast Guard regulations on type approval of ballast water systems.


Diatoms. NOAA Corps Collection image (public domain)


The regulations specifically require ballast water treatment systems to be evaluated based on their ability to kill certain organisms.

Read more from MarineLog here…


posted by Mai Armstrong for the Working Harbor Committee