Bring back pilchards, I say...

The European pilchard, Sardina pilchardus, is a migratory fish, like its cousin the herring, and there was a prolific pilchard fishery off the Cornish coast in the Middle Ages. By the nineteenth century, the fish had become the centre of a vital and profitable trade in the West Country. Most of the pilchards caught were salted, packed into barrels, and exported to Europe. Nothing from the curing process would be wasted and even the oil that drained from the barrels would be sold to the leather tanners for their lamps. The skimmings from the water in which the fish were washed was bought by soap boilers, and any damaged fish went for manure.