What additional, often faint, anatomical reference point can sometimes be observed running along the flank of mature specimens?
Answer
A faint, dark line running along the lateral line
Beyond the highly visible yellow stripe and the coloration of the fins, experienced observers utilize the lateral line system for supplementary identification, particularly in mature specimens. A faint, dark line can sometimes be discerned running precisely along the lateral line—the system used by the fish for sensory input regarding water movement. This line is considerably less obvious than the primary yellow stripe and its visibility is often dependent on lighting conditions or the overall condition of the fish, but its position relative to the dorsal profile can be a useful differentiator.
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