Mae hyn yn rhan bwysig o economi Cymru, gyda Grŵp Porthladdoedd Cymru'n amcangyfrif bod rhyw 11,000 o swyddi'n uniongyrchol neu'n anuniongyrchol gysylltiedig â phorthladdoedd Cymru.
This activity plays a crucial role in the Welsh economy, with the Welsh Ports Group estimating around 11,000 direct and indirect jobs were connected to Welsh ports.