Welcome to the MFK!
RTCs don't get prepared feed in the wild. They are equipped to deal with spiny, prickly, armored, etc. meals. They also benefit from wholesome meals.
I'd make sure the shrimp was not treated with anything, for instance, formaldehyde / formalin, to preserve color and freshness.
Shrimp are high in thiaminase, so cooked is better in this regard as cooking destroys thiaminase.