Ethiopian cuisine
Both Ethiopian Orthodox Christians and Muslims avoid eating pork or shellfish, for religious reasons. Pork is considered to be unclean in both Ethiopian Orthodox Christianity and Islam. Many Ethiopians would abstain from eating certain meats, and would mostly eat vegetarian and vegan foods.
List of halal and kosher fish
In Judaism, in addition to requiring the presence of true fish scales, kosher fish must also have fins. This seemingly redundant requirement serves to remove ambiguity by excluding finless sea creatures that possess various features which might be confused for scales, including shells (such as those of shrimp or prawns). While not every fish that has fins will have scales, every true fish that has true fish scales by default also has fins. As per the modern scientific definition, in Judaism also, the shells of crustaceans are their exoskeleton ("outer skeleton"), and they are thus not kosher for not only lacking fins but also for lacking true scales.