I thought this had been covered before but cannot find it with Search. So, ...
In 1986, when Boeing owned de Havilland Canada, they offered two maritime patrol DHC-8 derivatives dubbed Triton. These were a short-bodied DHC-8-200 airframe-based general maritime patrol aircraft and the longer-bodied Dash 8M-300ASW. The Dash 8-200 was similar in appearance to the DHC-8-102-based Canadian Forces CC-142 nav trainer with its extended nose radar modification.
For the ASW role, Triton would be fitted with 4 x underwing pylons and 2 x fuselage-side hardpoints - for Harpoon (or Exocet) ASMs. The aircraft was to have an underbelly radome for search radar and a MAD tailboom. Carrying maximum fuel, Triton endurance was to be over 11 hours.
Boeing Canada pitched their Triton to replace the aged Canadian Forces Grumman CP-121 Tracker fleet on fisheries protection and maritime patrol. But DND intended to upgrade the CP-121s (including turboprop conversions). Instead, in 1990, the CP-121s were withdrawn from service without direct replacement. By then, Boeing Canada had already abandoned the Triton and was trying to sell off DHC.