In religion
Shellfish and eels cannot be eaten according to what?
Seafood
For the most part Islamic dietary laws allow the eating of seafood, though the Hanbali forbid eels, the Shafi forbid frogs and crocodiles, and the Hanafi forbid bottom feeders such as shellfish and carp. The Jewish laws of Kashrut forbid the eating of shellfish and eels. According to the King James version of the bible, it is alright to eat finfish, but shellfish and eels are an abomination and should not be eaten. Since early times, the Catholic church has forbidden the practice of eating meat, eggs and dairy products at certain times. Thomas Aquinas argued that these "afford greater pleasure as food fish, and greater nourishment to the human body, so that from their consumption there results a greater surplus available for seminal matter, which when abundant becomes a great incentive to lust." In the United States, the Catholic practice of abstaining from meat on Fridays has popularized the Friday fish fry, and parishes often sponsor a fish fry during Lent. In predominantly Roman Catholic areas, restaurants may adjust their menus during Lent by adding seafood items to the menu.