A fish fry is a meal containing battered or breaded fried fish. It usually also includes french fries, coleslaw, hushpuppies, lemon slices, tartar sauce, hot sauce, malt vinegar and dessert. Some Native American versions are cooked by coating fish with semolina and egg yolk.
Fish is often served on Friday nights during Lent as a restaurant special or through church fundraisers. Beer is a common beverage of choice to accompany a fish fry. A fish fry may include potato pancakes (with accompanying side dishes of sour cream or applesauce) and sliced caraway rye bread if served in a German restaurant or area.
A Shore Lunch is traditional in the northern United States and Canada. For decades outdoor enthusiasts have been cooking their catch on the shores of their favorite lakes. 
Fish fries are very common in the Midwestern and northeastern regions of the United States. This is especially true for predominantly Roman Catholic communities on Fridays during Lent, when regulations call for abstinence from most meat products.
Lenten fish fries
The tradition of Christians fasting on Fridays to recognize Jesus's crucifixion on Good Friday dates to the first century CE. Fish had been associated with religious holidays even in pre-Christian times. The first mention of fish in connection with Lent comes from Socrates of Constantinople, a church historian in the third and fourth centuries who spoke of abstaining from meat and meat products (such as cheese and eggs) during the 40 days of Lent. The custom was mentioned by Pope Gregory I, who was elected in 590, and was later incorporated into canon law. Roman Catholic tradition has been that the flesh of warm-blooded animals is off limits on Fridays, although the 1983 Code of Canon Law provided for alternative observances of the Friday penance.
Northeastern United States
Battered or breaded haddock and cod fish fry is one of the trademarks of upstate New York cuisine and northwestern Pennsylvania, especially Buffalo and Rochester, as well as Albany, Syracuse, New York, and Utica, New York. The majority of restaurants in these cities serve a fish fry on Friday, even outside Lent, and it's often available throughout the week.  These meals consist of a piece of fish, coleslaw, potato salad, macaroni salad, and french fries.
Southeastern United States
In the southern United States, a fish fry is a family or social gathering, held outdoors or in large halls. At a typical fish fry, quantities of fish (such as bream, catfish, flounder and bass) available locally are battered and deep fried in cooking oil. The batter usually consists of corn meal, milk or buttermilk, and seasonings. In addition to the fish, hushpuppies (deep fried, seasoned corn dumplings), and cole slaw are served. These events are often potluck affairs. In Georgia and South Carolina, fish are dipped in milk, then into a mix of flour, cornmeal and seasonings before frying. Cheese grits is often a side dish.
Midwestern United States
The modern fish fry tradition is strong in Wisconsin, where hundreds of eateries hold fish fries on Fridays, and sometimes on Wednesdays. The Friday night fish fry is a popular-year round tradition in Wisconsin among people of all religious backgrounds. Fish fries there are offered at many non-chain restaurants, taverns that serve food, some chain restaurants, and at Roman Catholic churches as fundraisers. A typical Wisconsin fish fry consists of beer batter fried cod, perch, bluegill, walleye, or in areas along the Mississippi River, catfish. The meal usually comes with tartar sauce, french fries or German-style potato pancakes, coleslaw, and rye bread, though baked beans are not uncommon. The tradition in Wisconsin began because Wisconsin was settled heavily by Catholics of German, Polish, and other backgrounds whose religion forbade eating meat on Fridays. The number of lakes in the state meant that eating fish became a popular alternative.  Scandinavian settlements in northern and eastern Wisconsin favored the fish boil, a variant on the fish fry, which involves heating potatoes, white fish, and salt in a large cauldron. 
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