Habitat preference, movements and growth of giant mottled eels, Anguilla marmorata , in a small subtropical Amami-Oshima Island river

A two-year study on Amami-Oshima Island, Japan, revealed that giant mottled eels (Anguilla marmorata) exhibit distinct habitat preferences and movement patterns in subtropical rivers. Eel density was highest near the river mouth, particularly in vegetated areas, while they avoided concrete and sand banks. Small eels preferred riffle or run habitats characterized by specific depth and velocity, whereas larger individuals were found in varied conditions. The study also documented that eels disperse both upstream and downstream from the tidal limit, with growth rates varying significantly among individuals. Notably, small eels exhibited greater mobility than larger ones, traveling distances up to 380 meters compared to a maximum of 120 meters for larger eels. This research provides critical insights into the ecological behavior of tropical eels, offering a foundation for targeted conservation strategies.

Itakura, H., & Wakiya, R. (2020). Habitat preference, movements and growth of giant mottled eels, Anguilla marmorata , in a small subtropical Amami-Oshima Island river. PeerJ, 8, e10187. Portico. https://doi.org/10.7717/peerj.10187