Family of fishes
The deep-sea smelts are any members of the family Bathylagidae, a distinct group of marine smelts.
Deep-sea smelts are marine fishes found in deep waters throughout the oceans, down to in depth. They are small fishes, growing up to long. They feed on plankton, especially krill.
Extinct genera known only from fossil remains include "Quaesita" from California, USA and "Krumvirichthys" from the Czech Republic. The oldest fossils are otoliths from the Maastrichtian.
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