An eel is considered any fish that belongs to the order of Anguilliformes, however, not all “eel” are members of the Anguilliformes order. Similarly shaped fish, e.g., spiny eel, electric eel, are not members. They begin life as a flat transparent larvae that drift in the surface waters of the sea then metamorphose into glass eels and then change into elvers before finally seeking their juvenile and adult habitats. We know most eels are predators, but in the grand scheme of things, we know relatively little about their behavior.
Because relatively little is known about the behavioral responses of eel, researchers are using acoustic tags to help obtain previously unknown behavioral information. Researchers track the behavior and survival of eel to learn more about their route selection, escapement, passage, and/or possible entrainment. Studies include detecting eels behavioral response to manipulated flows during seaward-migration and behavioral responses to changing forebay conditions at a dam.
Here are a couple studies illustrating eel behavior in efforts to improve fisheries management for eels around the world: