How many letters does the top answer for “a deep-sea fish with a tapering body, smooth skin, and long threadlike tail” have?

The most common answer is chimaera (8 letters).

Crossword clue: a deep-sea fish with a tapering body, smooth skin, and long threadlike tail

1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

chimaera 8 letters wn-def

a deep-sea fish with a tapering body, smooth skin, and long threadlike tail