The blacktail buckbill eel (Saurenchelys fierasfer), also known commonly as the blacktail duckbill,Saurenchelys fierasfer at the IUCN redlist. or the duckbill eel in Malaysia,Common names of Saurenchelys fierasfer at www.fishbase.org. is an eel in the family Nettastomatidae (duckbill/witch eels). at www.fishbase.org. It was described by David Starr Jordan and John Otterbein Snyder in 1901, originally under the genus Chlopsis.Jordan, D. S. and J. O. Snyder, 1901 (28 Aug.) [ref. 2508] A review of the apodal fishes or eels of Japan, with descriptions of nineteen new species. Proceedings of the United States National Museum v. 23 (no. 1239): 837-890. It is a marine, tropical eel which is known from the western Pacific Ocean, including Japan, China, Malaysia, the Philippines, and Taiwan. It is known to dwell at a depth range of . Males can reach a maximum total length of .
Due to its wide distribution and tendency to dwell in deep waters, the IUCN redlist currently lists the blacktail buckbill eel as Least Concern. It notes, however, that the eel occurs in a region heavily affected by fisheries, and may be caught as by-catch despite not being of commercial interest.
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