Israeli operator Zim is taking its tally of 7,000-teu boxships to be chartered from leading containership owner Seaspan Corp up to 15 ships.

The deal comes as Asiatic/Atlantic Lloyd (AL) shipowning group also confirmed it has doubled its tally of 7,100-teu containerships on order in China.

The agreements reflect growing interest from tonnage providers and liner operators in the intermediate boxship segment, where more than 80 vessels of around 7,000 teu could soon be on order.