The good news is that this nutrient can be found in numerous foods.  According to one source,

“There are three types of omega-3’s: alpha-linoleic acid, docosahexaenoic acid, and eicosapentaenoic acid. HA and EPA are the most studied for  health benefits and are found in seafood like tuna, sardines, herring, salmon, swordfish, and anchovies. It is also found as a vegan sea source in algae. ALA is a source of omega 3’s found in plant sources, such as flaxseed and walnuts.”