Mae maint y traffig ym mhorthladd Caergybi wedi gostwng tua 50% o’i gymharu â’r llynedd, ac mae maint y traffig yn Abergwaun a Doc Penfro tua 40% yn is.  Mae llawer o’r traffig hwn wedi’i ddargyfeirio i ffwrdd o borthladdoedd Cymru i lwybrau uniongyrchol rhwng Iwerddon a’r UE a Gogledd Iwerddon a Phrydain Fawr.
Volumes at Holyhead port have declined by around 50% compared to last year, and volumes at Fishguard and Pembroke dock are around 40% down.  Much of this traffic has been diverted away from Welsh ports to direct routes between Ireland-EU and Northern Ireland-GB.