Bombay duck

Harpadon nehereus is a species of lizardfish. Adults may reach a maximum length of 40 cm (16 in), but the usual size is around 25 cm (10 in). In the early days Bombay Duck caught in Bombay used to be discarded. However, this fish was considered a delicacy in Bengal. When the railways began their journey in India, this fish was transported from Bombay to Calcutta. Since they used to get transported in a mail train, the fish got its name Bombay Mail fish (shortened to Bombail or Bombil) or Bombay Daak (Daak is mail in Bengali). Some claim that this name was given by a British official (perhaps Robert Clive, mentioned later) who hated the overpowering smell of the fish in the train. According to local Bangladeshi stories,[citation needed] the term Bombay duck was first coined by Robert Clive, after he tasted a piece during his conquest of Bengal. He is said to have associated the pungent smell with that of the newspapers and mail which would come into the cantonments from Bombay. The term was later popularised among the British public by its appearance in Indian restaurants in the UK.

Source: Wikipedia