### Chinese: 从2003年起，青海省实施封湖育鱼，禁止任何单位、集体和个人到青海湖及湖区主要河流及支流捕捞裸鲤，禁止销售裸鲤及其制品。
### English: Since 2003, Qinghai Province has closed the lake to raise fish, prohibiting any unit, collective or individual from fishing naked carp in Qinghai Lake and its main rivers and tributaries, and prohibiting the sale of naked carp and its products.
### Errors: There is a major error of incorrect translation includes information not present in the correct translation at "naked carp". There is a major error of incorrect translation is missing content from the correct translation at "lake instead of lakes". There is a minor error of incorrect translation has stylistic problems at "has closed the lake instead of has closed lakes".

### Improved English: From 2003, Qinghai province implemented the closure of lakes for fish breeding, prohibited any unit, collective or individual from fishing gymnocypris przewalskii in the main rivers and tributaries in the lake area, and prohibited the sale of gymnocypris przewalskii and their products.