In British English, a fish slice is a kitchen tool with a wide flat blade with long holes in it, used for lifting and turning food while cooking.
It was originally a serving implement for fish, usually made of silver. Fish slices were made of silver or Sheffield plate rather than steel to avoid the possibility of tainting the taste of the fish due a reaction between the fish and its lemon seasoning and the steel. After 1745 their outlines were usually fish shaped.
The term now refers to an implement used for turning fish and other foods when frying them, available in many materials such as stainless steel. In the US a fish slice is regarded as a type of spatula and may be called a turner.
Silicon slices, spatulas or turners have as distinct advantage over the plastic type as they do cannot burn or melt.