论文部分内容阅读
早在一百多年前达尔文就说过“蚯蚓是地球上最有价值的动物”,但一直未引起人们的重视。直到本世纪六、七十年代,由于公害日益突出,环境污染日趋严重,迫使人们寻求各种方法保护环境,蚯蚓才引起人们的重视,蚯蚓养殖业也应运而生。目前,日本、美国、加拿大、新加坡、法国、菲律宾等国家的蚯蚓养殖业正在大力发展,国际上蚯蚓年贸易额已达数十亿美元,美国蚯蚓贸易额以每年30～40％的速度递增。日本虽起步较晚,但发展快,年贸易额达20亿日元,是世界上最大的蚯蚓消费国之一,对蚯蚓
As early as a hundred years ago, Darwin once said that “earthworms are the most valuable animals on the earth,” but they have not drawn the attention of people all the time. Until the sixties and seventies of this century, due to the increasingly prominent pollution, the increasingly serious environmental pollution, forcing people to seek ways to protect the environment, earthworms have attracted people’s attention, earthworm breeding industry has emerged. At present, the earthworm breeding industry in Japan, the United States, Canada, Singapore, France and the Philippines is developing vigorously. The annual trade volume of earthworms in the world has reached billions of U.S. dollars and the trade volume of earthworms in the United States has increased at an annual rate of 30-40%. Although Japan started late, its development is rapid with an annual trade volume of 2 billion yen. It is one of the largest consumers of earthworms in the world,