Shortspine Thornyhead and Similar Species
Sebastolobus alascanus
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Open the appSeveral fish can be confused with Shortspine Thornyhead. Here are the key differences.
Species often confused with {name}
Longspine Thornyhead
Sebastolobus altivelis
Key differences: The Longspine Thornyhead has significantly longer and more numerous head spines, particularly the parietal and nuchal spines. Crucially, its third dorsal spine is longer than the longest soft ray, whereas in the Shortspine Thornyhead, the third dorsal spine is shorter than the longest soft ray. The second anal spine is also typically shorter than the third in S. altivelis, opposite to S. alascanus.
Roughspine Thornyhead
Sebastolobus macrochir
Key differences: The Roughspine Thornyhead is found primarily in the western Pacific (Japan, Okhotsk Sea) and has a more robust body and rougher scales. Its head spines are generally more pronounced and numerous than S. alascanus, and it typically has fewer pectoral fin rays (18-20).
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