I have 2 young kids and my wife are pregnant with another one. My wife have been frequently advise to eat more fish especially those with high Omega 3 content as Omega 3 are good for brain development. It also have the same benefits for young child and also benefit adult in one way or another.

However, I realize that there is also the concern of mercury content in fish especially popular high Omega 3 content fish such as Tuna, Salmon and etc. To deal with that, I am thinking of eating plant based Omega 3 & local freshwater fish with lower Omega 3 content fish (not sure how low) but recently I heard that freshwater fish actually have higher mercury content that can affect brain development. I am confuse  . Do you guys have any info about this?

Other than that, I also wanted to show my kids the photo of those fish before it is cooked & served on a plate as I noticed many youngster today don't even know what kind of fish that they're eating. (Including myself, I only know few but not really sure how to differentiate it). I don't want my kids to be like those kids in developed country like USA & etc that don't even realize the foods that they eat especially meat are living being that have head, feet, name and etc before being served as food.

And being a Chinese and living in Malaysia, I also want to know and tell my kids the name of those fish in Chinese, Malay and etc. Hope you guys have some info about this.