How does the dorsal fin of the White Marlin typically compare to that of the Blue Marlin (Makaira nigricans)?
Answer
The White Marlin typically has a noticeably more arched dorsal fin
Distinguishing between closely related billfish species often requires observation of subtle, yet consistent, morphological differences molded by distinct evolutionary paths within the Istiophoridae family. Specifically when comparing *Kajikia albida* to the Blue Marlin (*Makaira nigricans*), the White Marlin is noted for having a dorsal fin that is noticeably more arched in shape compared to the Blue Marlin's structure. Furthermore, in adult White Marlins, this arched dorsal fin can reach a height that is comparable to the length of the fish's pectoral fin when the fish is at rest, serving as a practical field identifier alongside the difference in bill slenderness.
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