I'm told its a gut worm stingray ,when the host fish dies the worm eats its way out because it needs to find a new host.
They not fussy about how the escape they just eat their way out ,through the flesh .I generally head & gut them cut in half to fit into my pack .No where near as ugly when you cut the head off either. Leave them any length of time & if they are carrying worm then you got a problem .
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