Yes, all vegetables are as far as i know. It's raw fish and seafood you have to be careful with. Your doctor should have a list of all the do's and don't s.
Why dont you speak to a healt advisor that can give you an proper answer. You will get hundreds of different answers if you ask a question on the internet. You probably will be more confused. :)
Yes, from what I have come up with, freshwater perch is safe to eat during pregnancy. However, the websites did mention no more than 12 ounces of any fish should be eaten within a week.
You need to speak to your ob/gyn due to the Mercury that fish contains. Very small portions are okay, but my daughter-in-law is pregnant and she was told no fish.