However, the brisling sardines are tinier in size than the regular sardines. Each can contains up to 12 sardines that are rich in calcium, iron, protein, and Omega-3 and 100% gluten-free, non-GMO, and low in carbs. There’s, therefore, no possibility of finding mercury in the water. Specific seas in which the species occurs include the Irish Sea, Black Sea, Baltic Sea and Sea of the Hebrides. This might not be true for all the other kinds of sardines. However, if you don’t mind going to a little more trouble, you can slice open the sardine lengthwise and remove the spine, which reduces their mercury content even further. Crown Prince Brisling Sardines ($2.99 for 3 3/4 ounces, Whole Foods), from Scotland, came in third. Brisling Sardines vs Regular Sardines. With an extra-spicy flavor, these tiny Brisling sardines will take your tacos, nachos, sandwiches, tostadas, and more to the next level. Most other brands are okay. The European sprat (Sprattus sprattus), also known as bristling, brisling, garvie, garvock, Russian sardine, russlet, skipper or whitebait, is a species of small marine fish in the herring family Clupeidae. The panel praised their appearance, calling them "beautiful, intact fish." The brisling sardines only exist in pure waters like Norway. They are fine to eat. Found in European waters, it has silver grey scales and white-grey flesh. They are both just kinds of sardines. Brisling sardines are only sold with the skin and bones.