Recreational fishing, also called sport fishing, is fishing for pleasure or competition. It can be contrasted with commercial fishing, which is fishing for profit, or subsistence fishing, which is fishing for survival.

The most common form of recreational fishing is done with a rod, reel, line, hooks and any one of a wide range of baits. Other devices, commonly referred to as terminal tackle, are also used to affect or complement the presentation of the bait to the targeted fish. Some examples of terminal tackle include weights, floats, and swivels. Lures are frequently used in place of bait. Some hobbyists make handmade tackle themselves, including plastic lures and artificial flies. The practice of catching or attempting to catch fish with a hook is known as angling.

Big-game fishing is conducted from boats to catch large open-water species such as tuna, sharks and marlin. Noodling and trout tickling are also recreational activities. One method of growing popularity is kayak fishing. Kayaks are stealthy and allow anglers to reach areas not fishable from land or by conventional boat. In addition, fishing from kayaks is regarded by some as an effort to level the playing field, to a degree, with their quarry and/or to challenge their angling abilities further by bringing an additional level of complexity to their sport. Historically, sport fishing has attracted greater interest among males. Women and girls represent barely 10% of the angling community, yet those who do enter the sport are often extremely successful, and at the highest levels of competitive angling, their results are comparable to those of their male counterparts.

Professor Geoffrey Alan Parker FRS (born 24 May 1944) is a Derby professor of biology at the University of Liverpool.

He has a particular interest in behavioural ecology and evolutionary biology, and is most noted for introducing the concept of sperm competition in 1970. Much of his work from the 1970s onwards has related to the application of game theory (theory of games) to various biological problems, using the evolutionarily stable strategy (ESS) approach pioneered by John Maynard Smith and George Price. With R. R. Baker and V. G. F. Smith in 1972, he proposed a leading theory for the evolution of anisogamy and two sexes, and in 1979 made the first theoretical analysis of sexual conflict in evolution. He has also investigated the evolution of competitive mate searching, animal distributions, animal fighting, coercion, intrafamilial conflict, complex life cycles, and several other topics.

Parker was educated at Lymm Grammar School in Lymm, Cheshire, and gained his BSc from University of Bristol in 1965, from where he also gained a doctorate in 1969 under H.E. Hinton, FRS (1912–1977). His Ph.D. was on The reproductive behaviour and the nature of sexual selection in Scatophaga stercoraria L. (yellow dung fly), and provided a detailed quantitative test of Darwin's theory of sexual selection, and an early application of optimality theory in biology.