this is totally irrelevant but I am a long time vegetarian (and a blonde apparently) it's so funny I had to share. When I first read this post I thought for a second... as a pet? Hmm that's highly unusual, how would a two year old care for a fish... wait...
HAHA, hope you get a laugh. I think that you can probably give him fish but if it's one of the fish that has a mercury risk the be careful as little bodies are more sensitive to smaller amounts of the toxin. Your pediatrician should be a good source of info on the nutrition topic.
at 3:59 PM on Jan. 11, 2011