Purim Plaque (detail), Montreal, Canada, ca. 1950 © Tel Aviv, Gross Family Collection
Fish
For a fish to be kosher it must have fins and scales - the kosher list informs its readers of acceptable species on the market. Canned fish is kosher from any food production company, if there are no additives.
In addition to milk and meat, there are neutral foods called pareve that include fruit, vegetables, eggs, and fish. These foods can be prepared and eaten with either meat or dairy products.