Tetrapturus pfluegeri, the Longbill spearfish, is a species of marlin native to the Atlantic Ocean where it is found above the thermocline in open waters. This species can reach a length of 254 centimetres (100 in) and the maximum weight recorded is 58 kilograms (130 lb). The longbill spearfish is a blueish black color from above, and silvery-white and brown on the sides. The pectorals are blackish-brown and the dorsal fins are dark blue.