Great post. Thanks. Sardines are an excellent way to get your Omega 3s without all the mercury. Also good for brain health.
“Sardines provide 2 grams of heart-healthy omega-3s per 3 ounce serving, which is one of the highest levels of omega-3 and the lowest levels of mercury of any fish. They contain a great source of calcium and Vitamin D, so they support bone health, too. Other than fortified products, there are few other food sources of Vitamin D.”
https://health.clevelandclinic.org/3-fish-you-should-love-and-3-fish-you-should-snub/
Because they're so low on the food chain. Although, I di enjoy a fish steak once in a while, tuna, mahi mahi, swordfish, etc. I used to eat shark, but I no longer see that in the supermarkets.