When will u intro seafood like crabs, prawns etc. to your children?

I introduced prawns at 6m when she just started solids. No reaction. It wasn't her first meal. It was just part of the meal we had in that month. Neither of us had any allergies so we allowed her to try anything we ate as long as it wasn't too unhealthy. Specifically no reaction to crab but rashes with mussels. We kept a look out for any reactions and rashes appeared after trying eggs, plums, eggplants, and mussels, of which we just stopped and tried again week after week or month after month to see if there was any reaction. She was ok with eggs after a week. The rest, after a few months. The only exception was honey, which we introduced after 1yo due to risks of botulism.