Grass carp culture began in the areas along the Yangtze and Pearl Rivers in the southern part of China. Compared to common carp, the culture of grass carp started much later. According to historical records, the culture of grass carp was closely related to the will of the current governor. In the Tang Dynasty 618-904 A.D., the family name of the emperor happened to be pronounced the same in Chinese as common carp, the only fish cultured then. The royal family prohibited common carp to be sold and killed by the people. Therefore, grass carp was chosen by the farmers as a substitute for aquaculture together with silver carp, bighead and black carp; this was because the seed of these fish were easily available in the areas along the Yangtze River and the Pearl River. The culture of grass carp remained relatively small in scale due to the dependence on the natural supply of seed. Success in induced breeding technology significantly promoted its culture. The fish has been introduced to more than 40 other countries; sometimes it is referred to as the white amur. About 10 000 tonnes/yr in 1950, the global production of farmed grass carp had reached over 100 000 tonnes/yr by 1972, exceeded 1 million tonnes/yr by 1990, and has been above 3 million tonnes/yr since 1999. China is by far the major producer 3 419 593 tonnes in 2002, 95.7 percent of the global total.
圖片編號:
222281143
拍攝者:
Mikih5
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標準授權 | XS | 480 x 360 | JPG | 13 | |
標準授權 | S | 800 x 600 | JPG | 15 | |
標準授權 | M | 2000 x 1500 | JPG | 18 | |
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進階授權 | WEL | 4608 x 3456 | JPG | 88 | |
進階授權 | PEL | 4608 x 3456 | JPG | 88 | |
進階授權 | UEL | 4608 x 3456 | JPG | 88 |
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標準授權 | 480 x 360 px | JPG | 13 點 |
標準授權 | 800 x 600 px | JPG | 15 點 |
標準授權 | 2000 x 1500 px | JPG | 18 點 |
標準授權 | 2581 x 1936 px | JPG | 20 點 |
標準授權 | 3265 x 2449 px | JPG | 22 點 |
標準授權 | 4608 x 3456 px | JPG | 23 點 |
標準授權 | 6517 x 4888 px | TIF | 39 點 |
進階授權 | 4608 x 3456 px | JPG | 88 點 |
進階授權 | 4608 x 3456 px | JPG | 88 點 |
進階授權 | 4608 x 3456 px | JPG | 88 點 |