I started eating salmon as it is an excellent source of omega-3 fatty
acids. I usually bake it in the oven at a temperature of about 425
degrees for about 20 minutes (as suggested on the packet in which it
comes). I am wondering if this is the right thing to do. This is what
I read from a website about the effect of heat on omega-3 fatty acids.

"Polyunsaturated oils, including the omega 3 fats, are extremely
susceptible to damage from heat, light, and oxygen. When exposed to
these elements for too long, the fatty acids in the oil become
oxidized, a scientific term that simply means that the oil becomes
rancid.

Rancidity not only alters the flavor and smell of the oil, but it also
diminishes the nutritional value. More importantly, the oxidation of
fatty acids produces free radicals, which are believed to play a role
in the development of cancer and other degenerative diseases."

So if I prepare salmon in the way I described, will it still retain
its nutritional value? If not, what is an easy way of preparing it
without losing nutritional value? Thanks.