Species diversity of freshwater glass eel (Anguilliformes, Anguillidae) of Yilan, Taiwan, with remark on two new records.

Yilan, Taiwan is the first place in East Asia where freshwater glass eels, the juvenile stage of species, arrive by ocean currents. We collected glass eels by fyke net in Lanyang River estuary twice a month from July 2010 to November 2023. By morphological examination and sequencing of the mitochondrial cytochrome b gene, we identified seven species of . Most of the glass eels captured in Yilan belonged to the species , , and . Only a few were , and two were recorded. In addition, two species were recorded for the time time from Taiwan; and were confirmed by cytochrome b sequencing. Thus, we increase the number of species in Taiwan from five to seven.