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Objective To understand the residual levels of semicarbazide in crustacean aquatic products such as shrimp and crabs, analyze the causes of endogenous and exogenous contamination. Methods Data from nationwide sampling inspections of crustacean aquatic products from 2017 to 2023 were analyzed. A total of 178 batches of shrimp, 136 batches of crabs, and aquaculture pond water samples were collected and tested. The quantitative determination was conducted following the standard of Ministry of Agriculture Announcement No.783-1-2006 Determination of nitrofuran metabolite residues in aquatic products. Results The detection level of semicarbazide in crabs was significantly lower than that in shrimp. The semicarbazide levels in crabs showed little correlation with species, while significant variations were observed among different shrimp species. No semicarbazide residues were detected in aquaculture pond water. Conclusion The presence of semicarbazide in crustacean aquatic products such as shrimp and crabs is primarily related to endogenous sources, though the detected levels from endogenous origins are very low. It is recommended that national authorities resume routine supervision and sampling inspections for nitrofurazone metabolites in crustacean products, establish a national database for semicarbazide monitoring, and utilize big data analysis to address current policy gaps. Furthermore, based on the analysis of the national database, efforts should be made to develop semicarbazide residue limit standards for crustacean aquatic products to ensure the healthy development of the aquaculture industry.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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