This is incorrect, check the Guide to Eating Sport Fish.
For my favorite fishing spot (Long Point Bay, Lake Erie) if you eat a 21" carp the guide recommends you limit eating that fish to 8 times per month. If you eat a 21" rainbow or brown trout, you should only eat that twice a month, meaning that the trout is 4x more contaminated for the size class.
The guide recommends zero consumption of rainbow or brown trout from that size class for pregnant women or children. However, it says pregnant women or children can eat carp 8 times a month!
https://www.ontario.ca/environment-a...ry?id=42408010