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一、前言当今,日本由于生活水平不断提高,对水产品的质量和品种的要求也越来越高。近几年日本养殖鱼类的总产量上升到25万吨。鰤鱼鳗鱼、鲤鱼的产量提高并不快,鲷类和香鱼的产量稳步上升。此外,尼罗罗非鱼和牙鲆的养殖开始普及,尤其牙鲆的养殖相当兴盛,1983年产量达3000吨。从1983年水产品输入量看,总产量增加了7%,达120万吨,金额上升到一兆日元,占全国渔业产值的三分之一以上。因
I. Preface Nowadays, due to the continuous improvement of living standards in Japan, the quality and varieties of aquatic products are also increasingly demanding. In recent years, the total output of farmed fish in Japan has risen to 250,000 tons. The yield of anchovy eel and carp is not fast, and the production of sea bream and sweetfish is steadily rising. In addition, the cultivation of Nile tilapia and Japanese flounder began to popularize. In particular, the cultivation of Japanese flounder was quite flourishing. In 1983, the output reached 3,000 tons. From the input of aquatic products in 1983, total output increased by 7% to 1.2 million tons and the amount rose to one trillion yen, accounting for more than one third of the national fishery output value. because