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Oceanography/Identification

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Beach Find
Beach Find  
Dear Sir, I found the attached item on St. Augustine Beach, Florida. Could you tell me what it is. It is about 7 1/2 inches long. Thank You in advance.

Answer
Marlin spine
Marlin spine  
Hi Linda

Hard to nail it down from just this photo, but my best guess is that you found a dorsal spine of a billfish,(perhaps a sailfish or marlin).

Spines from stingrays generally have serrations on both sides not just one, but I would not rule that out completely either.

The basal attachment area appears highly similar to that of the marlin spine (attached photo).

Best I can do from your pic.  

Cheers
Bill

Oceanography

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