What shape is the posterior edge of the Yellow Bullhead's anal fin?
Answer
Rounded or straight
The configuration of the anal fin provides another key anatomical feature used to differentiate the Yellow Bullhead from the Brown Bullhead. For *A. nataloides*, the posterior edge, or trailing margin, of the anal fin is typically observed to be rounded or straight. This morphology stands in opposition to the Brown Bullhead, whose anal fin edge is usually more distinctly indented or notched. This seemingly minor difference in fin structure is a reliable trait employed by biologists when performing close-range species verification.
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