Salmon and trout fishing in the Northern Pacific Ocean and whale catching in the Antarctic Ocean are especially important to Japan, not only as sources of animal protein but also as a means of securing foreign currencies. The refrigerated factory ship plays a central role in these type of fishing. Many modern refrigerated factory ships have been built in Japan since World war "II", installed with the latest equipment and machinery. For a short while after the war, because of scarcity of materials and lack of capital, the factory ships used were remodelled from war-time standard ships. Since then, however, one or two newly built refrigerated factory ships have been delivered every year, starting with the Miyazima maru in 1953. The main particulars are given of fourteen of these new ships. Three recent types are the midship engine type, the centre bridge type with engine aft, and the fore bridge type with engine aft: their operating performances are compared. The preliminary design of a factory ship, i.e., principal dimensions, stability, sea speed, sailing endurances, etc. is described. Some current problems on the equipments are also explained.
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