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Long-term loans - Additional information (Details)
Mar. 31, 2023
USD ($)
Mar. 31, 2022
USD ($)
Jan. 04, 2022
USD ($)
Jan. 04, 2022
CNY (¥)
Long-term loans        
Long-term loans $ 13,681,099 $ 14,809,302    
Fujian Xinqiao Ocean Fishery Group Co        
Long-term loans        
Long-term loans     $ 13,681,099 ¥ 94,012,410
Debt term     5 years 5 years
Interest rate     6.00% 6.00%