The fat/water relationship in the mackerel, scomber scombrus L., pilchard, sardina pilchardus (Walbaum), and sprat, sprattus sprattus (L.), and the seasonal variation in fat content by size and maturity /
Wallace, P. D.
Hulme, T. J.
Lowestoft :  Ministry of Agriculture, Fisheries and Food, Directorate of Fisheries Research, 
1977.