Which seafood is NOT considered kosher?

The correct answer is that catfish is not considered kosher. In Jewish dietary law, or kashrut, seafood must have both fins and scales to be considered kosher. While salmon, sardines, and trout all possess these characteristics, catfish do not. Catfish are known for their lack of scales, which disqualifies them from being kosher. This distinction is important for those observing kosher dietary laws, as it dictates what seafood can be consumed based on specific religious guidelines. Understanding these criteria helps individuals make informed choices about food consumption within the context of their dietary practices.