Freshwater Eel

Freshwater Eel (Anguilla marmorata)

Photo: Mike N. Yamamoto

Description:

  • Long cylindrical scaleless bodies with small pectoral fins (Schofield & Fuller, 2021)
  • Lower jaw protrudes beyond upper jaw (Schofield & Fuller, 2021)
  • Marbled coloration of black and brown hues (USFWS, 2018)

Habitat:

  • Live in estuaries and seas when young and move to freshwater as adults (USFWS, 2018)

Impacts & Concern:

  • No studies available in Hawai‘i to determine potential impacts of introduction (Schofield & Fuller, 2021)

Introduction:

  • Unknown means of introduction, possibly either an aquarium release or a food-fish escape (Schofield & Fuller, 2021)  
  • Failed to establish on Maui in 2002 (Schofield & Fuller, 2021)

Distribution in Hawaii:

  • Kauai: Unknown
  • O‘ahu: Unknown
  • Molokai: Unknown
  • Lanai: Unknown
  • Maui: Observed but not established
  • Big Island: Unknown

References:

  • Schofield, P.J., & Fuller, P. (2021) Anguilla marmorata Quoy and Gaimard, 1824: U.S. Geological Survey, Nonindigenous Aquatic Species Database, Gainesville, FL, Retrieved March 05, 2021, from  https://nas.er.usgs.gov/queries/FactSheet.aspx?SpeciesID=2291
  • USFWS. (2018). Anguilla marmorata Ecological Risk Screening Summary. U.S. Fish and Wildlife Service. Retrieved March 05, 2021, from https://www.fws.gov/fisheries/ans/erss/uncertainrisk/ERSS-Anguilla-marmorata-final-August2018.pdf