Caiff y sewin ei ddal o fewn tymor 5 mis, sy’n dechrau ar 1 Mawrth ar yr Afon Tywi a’r Taf a’r 1af Ebrill ar yr Afon Teifi, ond nid oes hawl i bysgota ar benwythnosau.
The sewin is caught in a 5-month season, starting on the 1st March on the River Tywi and Taf and the 1st April on the River Teifi, with no fishing permitted at weekends.