Omelet > wrote:
>
>Dirty shrimp veins are rather visible.
>It's not like you cannot see them in a raw shrimp.

Slightly dirty shrimp veins can be occluded by the flesh,
and by the shell if you're hoping to cook something shell-on.

Almost always, the entire school will have the same quantity
of poop in their chute, so checking a few may make the decision
for you.

--Blair