Yeah, i suppose i was mainly thinking of some fried chicken with MSG to dip that was just awesome as the comparison, but you're right its mainly used in cooking, whereas chicken salt is on top.

because it is too strong and dominates the fish flavour

Hadn't clocked this. Don't eat fish often, but when i do i'll make sure to remember this, i instantly imagined that overpowering sensation of the chicken salt as you describe.