You can eat most types of fish when you're pregnant or breastfeeding. Eating fish is good for your health and your baby’s development. However, you should avoid eating some types of fish and limit the amount you eat of others.
Fish to avoid during pregnancy
When you're pregnant or trying to get pregnant, do not eat:
shark
swordfish
marlin
These types of fish contain high levels of mercury, which can damage your baby’s developing nervous system.**
For information about avoiding raw shellfish, see Can I eat shellfish during pregnancy?
Fish to limit during pregnancy
Tuna
When you're pregnant or trying to get pregnant, you should limit the amount of tuna you eat because it also contains high levels of mercury. Don’t eat more than:
two tuna steaks a week (weighing about 140g when cooked or 170g raw)
four medium-sized cans of tuna a week (about 140g*a can when drained)
Oily fish
Pregnant women should also limit how much oily fish they eat because it contains pollutants such as dioxins and PCBs (polychlorinated biphenyls). Don’t eat more than two portions of oily fish a week. Oily fish includes:
fresh tuna (canned tuna doesn’t count as oily fish)
salmon
trout
mackerel
herring
sardines
pilchards
Other fish
You should also limit how much you eat of some other fish that are not regarded as oily. Don’t eat more than two portions a week of:
dogfish (rock salmon)
sea bass
sea bream
turbot
halibut
crab
Fish to limit during breastfeeding
When you’re breastfeeding:
Don’t eat more than one portion of shark, swordfish or marlin a week (this advice is the same as for all adults).
Don’t eat more than two more portions a week of oily fish.
You don’t need to limit the amount of canned tuna you eat while you’re breastfeeding.
Eating other fish during pregnancy and breastfeeding
Fish is an important part of a healthy diet. It’s a good source of protein and contains many vitamins and minerals. As part of a healthy diet, the general advice is to eat at least two portions of fish a week, at least one of which should be oily fish.
While you’re pregnant, trying to get pregnant or breastfeeding, you should also remember the advice above. You don’t need to limit or avoid other types of white and non-oily fish, such as:
cod
haddock
plaice
coley
skate
hake
flounder
gurnard
Hope this helps, NHS website is very informative
I think avoid Alaskan salmon apparently that does have higher levels than British salmon xxxx
