China has slapped crew change bans of up to 30 days on nine ship managers after it detected a number of Covid-19 outbreaks among crew.

The bans, which range between 15 and 30 days, have been applied to a total of 302 ships operated by the nine named companies, including vessels managed by TW Ship Management, Bernhard Schulte Shipmanagement Hong Kong, Navios Tanker Management, Hongxin Ship Management, Technomar Shipping and Shanghai Dingheng Shipping Technology.