They are both the same species, which has the Latin name Sardinus pilchardus. The smaller fish are known as Sardines and the larger, older fish are Pilchards. They range in size from 80g to 150g, and are ideal for grilling whole and served as a starter or for barbecuing. Fished off the coast, the French Coast and the Mediterranean, they tend to prefer warmer waters. Currently most of the UK catch goes to France where there is a bigger market for them.