You may find this article helpful https://www.healthychildren.org/English/safety-prevention/all-around/Pages/Protecting-Your-Children-From-Contaminated-Fish.aspx
Threadfin is the best.. Can give cod fish too if you want.
We've given batang and toman fillet too
Cod fish but best will be Threadfin.
Light tuna ?
cod fish?
Cod fish