Where is the blackish blotch consistently located on the first dorsal fin of the Yellow Perch?
Answer
On the membrane surrounding the rearmost three or four spines
Beyond the defining vertical striping, a subtle yet consistent anatomical feature used for identification is a specific marking on the first dorsal fin. This feature is a blackish blotch. This dark mark is precisely situated on the membrane tissue that connects or surrounds the final portion of the spiny structure, specifically involving the rearmost three or four spines of that anterior dorsal fin, serving as a reliable visual cue separate from the primary body barring.
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