Heterocongrinae

Heterocongrinae is a subfamily of marine eels in the family Congridae, commonly known as garden eels. Its members live in burrows and often extend their bodies into currents to feed.

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Burrowing: The act of excavating or occupying a tunnel in sediment or other material. Garden eels retreat into sediment burrows and reinforce them with mucus.
Eel: A long-bodied ray-finned fish belonging to the order Anguilliformes. Garden eels are specialized members of the broader eel lineage.
Coral reef: A marine ecosystem built largely by reef-forming corals and their associated organisms. Many garden eels inhabit sandy areas near coral reefs.
Heteroconger: A genus of garden eels in the subfamily Heterocongrinae. This genus contains many familiar garden eel species.
Plankton: Organisms that drift in water and cannot swim against currents effectively. Garden eels feed on plankton carried past their burrow openings.
Marine fish: A fish that lives in salt water, including coastal and open-ocean habitats. All living Heterocongrinae inhabit marine environments.
Aquarium: A container or facility that maintains aquatic organisms for display, study, or breeding. Public aquariums sometimes keep garden eels in deep sand beds and controlled currents.
Gorgasia: A genus of garden eels found in tropical marine habitats. Its species provide a distinct example of garden eel diversity.
Countercurrent exchange: A transfer process in which fluids flow in opposite directions, maintaining a gradient along their interface. Opposing water and blood flows help many fishes extract oxygen across their gills.
Gill: A respiratory organ that extracts dissolved oxygen from water in many aquatic animals. Garden eels remain submerged while exchanging gases through gills.