In Islamic terminology, something which is makruh (Arabic مكروه, also transliterated makrouh, makrūh etc.) is a disliked or offensive act (literally "detestable"). Though it is not haram (sinful), a person who abstains from this act will be rewarded. Muslims are encouraged to avoid such actions when possible. This is one of the degrees of approval (ahkam) in Islamic law.
An example of a food which is considered "makruh" for Hanafi Mazhab Muslim is prawns (but only for Hanafi Madh'hab Muslim) There is, however, shared attitudes within the Hanafi school of whether shrimp is part of fish life and thereby halal. Hanafi school look, however, at any time that you refrain from it and instead eat something other if possible. 
- Some of the Detestable (Makruh) Conducts in Islam (Shi’a site)
- Lawful to you is the pursuit of water game and its use for food, for the benefit of yourselves and those who travel; ….[5:96]..