Herrings and sardines are part of the same fish family. When they’re younger and smaller, herrings are referred to as sardines, which actually means “small fish”. Both are high in protein and good sources of vitamin D and zinc, however they do differ in taste and texture. Sardines have a fishier, oilier, saltier taste as well as a meatier texture. Herring, though, does provide a higher percentage of B vitamins, and slightly more omega-3 fatty acids.