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Long-term investment (Details)
1 Months Ended 12 Months Ended
Jan. 31, 2022
USD ($)
Jan. 31, 2022
CNY (¥)
Aug. 31, 2021
USD ($)
Aug. 31, 2021
CNY (¥)
Mar. 31, 2023
USD ($)
Long-term investment          
Balance as of March 31, 2022         $ 14,956,443
Share gain (loss) from equity investments         724,428
Impairment         (246,092)
Foreign currency translation adjustments         (1,137,955)
Balance as of September 30, 2022         14,296,824
Medical Star          
Long-term investment          
Balance as of March 31, 2022         282,545
Investments made     $ 308,385 ¥ 2,000,000  
Share gain (loss) from equity investments         (14,899)
Impairment         (246,092)
Foreign currency translation adjustments         (21,554)
Balance as of September 30, 2022          
Fujian Fishery          
Long-term investment          
Balance as of March 31, 2022         14,673,898
Investments made $ 14,809,302 ¥ 94,012,410      
Share gain (loss) from equity investments         739,327
Foreign currency translation adjustments         (1,116,401)
Balance as of September 30, 2022         $ 14,296,824