How is the tail fin (caudal fin) structure of the White Catfish characterized for classification?
Answer
Moderately forked
The structure of the tail fin, or caudal fin, serves as one of the most significant diagnostic features for the White Catfish. Unlike some of its bullhead cousins, such as the Yellow Bullhead which possesses a rounded or truncate tail, the White Catfish exhibits a tail that is distinctly and moderately forked. This fork is deep enough to be noticeable but is specifically noted as not being as sharply pointed or deeply forked as those found on even larger species like the Blue Catfish or Flathead Catfish. This intermediate state—more than a simple notch but less than a deep V-shape—is central to its identification, especially when differentiating it from other bullheads in the *Ameiurus* genus.

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