A cap on the quarterly landings of 15 tonnes of whelk per vessel, during the biologically sensitive period from October to December each year.
Cap o 15 tunnell o gregyn moch fesul cwch ar y cyfanswm y caniateir ei lanio bob chwarter, yn ystod y cyfnod biolegol sensitif rhwng mis Hydref a mis Rhagfyr bob blwyddyn.