Most carp specialists believe in high protein bait, developed by the late Fred Wilton in the late 1960s. The idea became widely known in 1973, when some carp anglers began studying the scientific aspects of how and why carp feed and locate food. One of the latest developments is the use of amino acids in carp baits, after the discovery that fish locate food by smell via the amino acids given off by the food.
Compared with Man, fish require very small amounts of substances for their taste senses to become aware of food. Certain pure chemicals have been proved to elicit both taste and smell responses in fish, and trigger off a feeding reaction. Some amino acids are prominent among these chemicals. But not a great deal is known, even by the scientists working in this field, about the exact nature of feeding reactions in fish, and how they are triggered off. It is probable that attractive scents which prompt fish into feeding are rarely single chemicals and more often mixtures of several of them. Remember too that only very small quantities of these chemicals are required. A disturbing point is that some of the substances being considered are dangerous, to fish and anglers.