Fish that can swim backward

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Possible Answers:

EEL.

Last seen on: NY Times Crossword 28 Apr 19, Sunday

Random information on the term “EEL”:

Amphiuma meansAmphiuma pholeterAmphiuma tridactylum

Amphiuma is a genus of aquatic salamanders from the United States, the only extant genus within the family Amphiumidae /æmfɪˈjuːmɪdiː/. They are colloquially known as amphiumas. They are also known to fishermen as “conger eels” or “Congo snakes”, which are zoologically incorrect designations or misnomers, since amphiumas are actually salamanders (and thus amphibians), and not fish, nor reptiles. Amphiuma exhibits one of the largest complements of DNA in the living world, around 25 times more than a human.

Numerous phylogenetic studies have indicated that amphiumas form a clade with the families Rhyacotritonidae (torrent salamanders) and Plethodontidae (lungless salamanders), with an especially close relationship to Plethodontidae. Despite this possible relationship, the two families must have still diverged very early on. The genus Proamphiuma from the Cretaceous is the earliest known member of the family, and closely resembles the modern species aside from less elaborate vertebral structures.

EEL on Wikipedia