Horse mackerel is a vague vernacular term for a range of species of fish throughout the English-speaking world. It is commonly applied to pelagic fishes, especially of the Carangidae (jack mackerels and scads) family, most commonly those of the genera Trachurus or Caranx. Species known as "horse mackerel" in one English dialect or another include:

Christopher Graham Davies (born 7 July 1954) is a Liberal Democrat politician in the United Kingdom. He is a former Member of Parliament, and since 1999 he has been a Member of the European Parliament.

Davies was born in Lytham St Annes, Lancashire. His father was a doctor, and his mother a nurse. He was educated at Cheadle Hulme School (1965–72), at Gonville and Caius College, Cambridge (1972–75, reading history) and from 1975 to 1977 at the University of Kent, Canterbury.

He became the MP for Littleborough and Saddleworth after a by-election in 1995, but the seat was abolished by the time of the 1997 General Election. Davies contested Oldham East and Saddleworth at this election but lost to Phil Woolas of Labour.

He was elected as a Member of the European Parliament for the North West England constituency in 1999.

Due to controversy over the tone of a series of emails he exchanged with a pro-Israeli constituent, Davies was forced to resign as leader of the Liberal Democrats group in the European Parliament. Davies now serves as the Liberal Democrat spokesman on the environment and public health in the European Parliament.