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Bloody(?) stripe inside next to fish backbone.
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What is the junk inside the fish gut that sits up next to the back bone? I used to think it was blood, but now I am not so sure any more. Are there any fish biologists out there that can explain what that is and what it does?
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Bloody(?) stripe inside next to fish backbone. - by iwantabuggy - 01-16-2011, 06:39 PM

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