high mercury level in fishes

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Fish is a good source of protien and, unlike fatty meat products it's not high in saturated fat. it is also a good source of omega-3 fatty acids which benifit heart health. Thou there are some fishes which do contain high mercury levels which is harmful for the health , especially for health of womens, expecting moms and pregnant ladies. Do you guys really know about it , if yes can you state what are those fishes with high mercury levels?