it is recomended to eat smaller fish..
all the large.. deep sea fish are not good.. since they live in the sea longer, then more heavy metal will be accumulated inside their body.
it was suggested to eat small fish with bone (e.g. sardine) the bone is high in calcium!
from a research finding a few months before by PWH, around 1000 newborn baby was checked for a heavy metal (I forgot whether it is mercury or lead). It was found that over 70% babies had high in that particular metal which may led to problem in brain/nervous system development. The finding concluded that, this may due to chinese believe that pregnant women need to eat more fish.. when the more expensive and larger fish was eaten.. the heavy metal will be deposited into mothers body then get into the fetus.
Since I cant really eat fish (although I am 16+wk already), I am taking fish oil supplement for the DHA & EPA needs.