The Louisiana Department of Wildlife and Fisheries has confirmed that an invasive species of eel was found in Bayou St. John.

The impact of the Asian swamp eel on native species is unknown, according to the LDWF.

Its diet consists of fish, shrimp, crawfish, frogs and other aquatic invertebrates, such as worms and insects.

In its native habitat, the Asian swamp eel is routinely found in shallow bodies of water and burrows into the shoreline for nesting areas and protection from predators.

Swamp eel 

It primarily lives in freshwater; however, it can tolerate brackish water for short periods.

“If this species becomes established in Louisiana, it could be the first population in the United States. Its impact to our native fish is unknown and something we will study. We are always concerned when we find potentially invasive, non-native species in the state,” said LDWF aquatic nuisance species coordinator Robert Bourgeois.

The eels are common food in many parts of Asia. How the eels found their way into Louisiana waterways is unknown. However, the most likely case is through an accidental release or the release of pets from an aquarium. Possession of live Asian swamp eels is prohibited under state law, and it is illegal to release a live Asian swamp eel into state waterways.

The LDWF is investigating how the eels were released into Bayou St. John.

Swamp eel 


Over the years, similar Asian swamp eel species have been found in New Jersey, Hawaii, Georgia and Florida.

Asian swamp eels are differentiated from native eels by the lack of any fin structures. It is also different from aquatic species, such as sirens or amphibians, as they lack tiny legs.

The LDWF is sampling surrounding bodies of water to determine how widely the eels have spread.

The department is asking the public to help determine the range of the non-native invasive by immediately placing any specimen collected in a plastic bag and placing it in a freezer.

You are asked to contact the department to arrange for pickup.

The LDWF will be developing a plan to protect the state’s aquatic resources from this non-native and invasive species.