ปลาส้ม คือ ferment fish with salt and glutanious rice like "แหนม" to preserve fish to keep it long time. Benefit to some fish that have a lot small bone cause bone fish turn to soft and eat able.
saltfish , you ;have to eat with rice, it is menu for rainy season when too much fish and dont know what to cook , we marinated fish with salt and roasted uncooked rice and keep fishes awhile for eat in the future