I would have to say that the original spear at the beginning of the thread was most likely for medium to larger fish. The shaft behind the tip is short but the tip has a large barb with a wide back for holding. Harpoons for very large animals or fish most often have a long shaft for deeper penetration through thick skin and blubber in hopes of hitting vital organs to help in the quicker death of the intended target. As far as multiple barbs over a single the holding power is mostly dependent on the width of the back side of the barb and the length of the barb itself.
Robert
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