Rokat was a fish commonly eaten by Cardassians as a dry, salted fillet.
In the 2310s, rokat fillets were often served aboard the ships of the Cardassian Guard, so much so that Skrain Dukat informed Kotan Pa'Dar that if he served a couple terms aboard a warship he would soon tire of the fish. (TLE - Terok Nor novel: Day of the Vipers)