The Boston cooking-school cook book

food fishes, and is caught in North Atlantic waters. Its skin is lustrous dark blue above, with wavy blackish lines, and silvery below. It sometimes attains a length of eighteen inches, but is usually less. Mackerel weigh from three-fourths of a pound to two pounds, and are sold by the piece. They are in season from May 1st to September 1st. Mackerel, when first in market, contain less fat than later in the season, therefore are easier of digestion. The supply of mackerel varies greatly from year to year, and some years is very small. _Spanish mackerel_ are found in waters farther south than common mackerel, and in our markets command higher price. =Salmon= live in both fresh and salt waters, always going, inland, usually to the head of rivers, during the spawning season. The young after a time seek salt water, but generally return to fresh water. Penobscot River Salmon are the best, and come from Maine and St. John, New Brunswick. The average weight of salmon is from fifteen to twenty-five pounds, and the flesh is of pinkish orange color. Salmon are in season from May to September, but frozen salmon may be obtained the greater part of the year. In the Columbia River and its tributaries salmon are so abundant that extensive canneries are built along the banks. =Shad=, like salmon, are found in both salt and fresh water, always ascending rivers for spawning. Shad is caught on the Atlantic Coast of the United States, and its capture constitutes one of the most important fisheries. Shad have a silvery hue, which becomes bluish on the back; they vary in length from eighteen to twenty-eight inches, and are always sold by the piece, price being irrespective of size. _Jack shad_ are usually cheaper than _roe shad_. The roe of shad is highly esteemed. Shad are in season from January to June. First shad in market come from Florida, and retail from one and one-half to two dollars each. The finest come from New Brunswick, and appear in market about the first of May. _Caviare_ is the salted roe