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The basic answer that most (myself included) would be tempted to give is simply that in order for a fish to be kosher, it needs to have both fins and scales. 1 Since shellfish do not have these signs, they are not kosher.
Kosher animals are animals that comply with the regulations of kashrut and are considered kosher foods. These dietary laws ultimately derive from various passages in the Torah with various modifications, additions and clarifications added to these rules by halakha.
The word "kosher," which describes food that meets the standards of kashrut, is also often used to describe ritual objects that are made in accordance with Jewish law and are fit for ritual use. Food that is not kosher is referred to as treif (literally torn).
The purpose of this list is to give the reader an idea of which species of fish are generally considered kosher. In practice however, its use is very limited. Unfortunately, the common, unscientific, names of fish are very inaccurate.
Any kind of food - Chinese, Mexican, Indian, etc. - can be kosher if it is prepared in accordance with Jewish law. At the same time, traditional Jewish foods like knishes, bagels, blintzes and matzah ball soup can all be treif if not prepared in accordance with Jewish law.
Learn about the Jewish dietary laws of kashrut (kosher), why we observe these laws, the various foods and combinations that are forbidden, and the certification of kosher foods.
7 lip 2021 · A kosher food that is processed or cooked together with a non-kosher food, or any derivative of non-kosher food, becomes non-kosher. For example, food coloring derived from shellfish and used in a cake makes the cake non-kosher.
