With mercury, one should avoid tuna. Salmon and mackerel is not hat bad about it.
Nope.king mackerel is one of four fishes that children and pregnant women should avoid due to high levels of methylmercury found in these fish and the consequent risk of mercury poisoning.
Back on topic. I just learnt that Kamil Baczyński, a WW2 poet and AK soldier, died in Warsaw Rising, was half Jewish.
A song performed by Ewa Demarczyk with Baczyński`s poem as lyrics