Clean Monday
Clean Monday is a public holiday in Greece and Cyprus, where it is celebrated with outdoor excursions, the consumption of shellfish and other fasting food, a special kind of azyme bread, baked only on that day, named "lagana" () and the widespread custom of flying kites. Eating meat, eggs and dairy products is traditionally forbidden to Orthodox Christians throughout Lent, with fish being eaten only on major feast days, but shellfish is permitted in European denominations. This has created the tradition of eating elaborate dishes based on seafood (shellfish, molluscs, fish roe etc.). Traditionally, it is considered to mark the beginning of the spring season, a notion which was used symbolically in Ivan Bunin's critically acclaimed story, "Pure Monday".
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.