<P> The Filet - O - Fish , otherwise known as the Fish - O - Filet , is a fish sandwich sold by the international fast food restaurant chain McDonald 's . It was invented in 1962 by Lou Groen , a McDonald 's franchise owner in Cincinnati , Ohio , in response to falling hamburger sales on Fridays resulting from the Roman Catholic practice of abstaining from meat on Fridays . While the fish composition of the sandwich has changed through the years to satisfy taste and supply shortcomings , the framework of its ingredients have remained constant ; a fried breaded fish fillet , a steamed bun , tartar sauce and pasteurized processed American cheese . </P>
<P> The Filet - O - Fish , otherwise known as the Fish - O - Filet , is a fish sandwich sold by the international fast food restaurant chain McDonald 's . It was invented in 1962 by Lou Groen , a McDonald 's franchise owner in Cincinnati , Ohio , in response to falling hamburger sales on Fridays resulting from the Roman Catholic practice of abstaining from meat on Fridays . While the fish composition of the sandwich has changed through the years to satisfy taste and supply shortcomings , the framework of its ingredients have remained constant ; a fried breaded fish fillet , a steamed bun , tartar sauce and pasteurized processed American cheese . </P>
when did mcdonald 's start serving filet o fish
when did mcdonald 's start serving filet o fish
1962
1962