That's a step in the right direction for sure but why not just cut it out of your diet entirely? There's nothing in fish you can't get from plant sources and with current ocean pollution levels even line caught fish are going to have a lot of heavy metals and PCBs in them.

Plant based vitamin D & B12? Do tell.

I don't eat a lot of fish or anything, but empirically it is shown to be a healthy thing to eat (well, certain species at least)