Bony Shark Spine???

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Low tide find bay, need help identifying please:)

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That's what I was thinking too. 150mm about 5inches. it would be worthwhile googling that topic.
 
It is a Stingray barb, some fisherman break them off before releasing the ray.
 
Not a stingray barb. Stingray barbs have heaps of tiny spikes so that when it goes in, it is difficult to pull out. Interesting bone
 

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