Chapter 03 covers fish, crustaceans, molluscs and other aquatic invertebrates, including live, fresh, chilled, frozen, dried, salted, smoked and other processed forms, but excluding cooked or preserved products (classified under Chapter 16). This chapter is divided into 7 headings, covering fish, crustaceans, molluscs, etc., and is a core classification chapter for international trade in aquatic products. Heading 0302 specifically refers to fresh or chilled fish, excluding fish fillets and other fish meat (0304), frozen fish (0303), fish fry (0301), etc. This heading is further subdivided by fish species, covering most fresh or chilled whole fish for human consumption, and is one of the most common headings in customs declaration for fresh aquatic imports. Code 030231 is a 6-digit subheading: the first 2 digits "03" represent Chapter 03 (fish and aquatic invertebrates); digits 3-4 "02" represent heading 0302 (fresh or chilled fish, excluding fillets, etc.); digits 5-6 "31" represent subheading 030231, specifically longfin tuna. The 5th digit "3" indicates the genus Thunnus spp., and the 6th digit "1" specifically refers to longfin tuna. The full code 030231.00.00 (which may be extended to 8-10 digits in various countries) is used for customs declaration. The product is fresh or chilled whole longfin tuna, not frozen, sliced or cooked, so it is classified under 0302 rather than 0303 (frozen fish) or 0304 (fish fillets). Longfin tuna belongs to the genus Thunnus and is further subdivided by species under 0302, so it is classified under 030231 rather than other tuna subheadings (such as 030232 yellowfin tuna).

Product Name: Fill in the standard Chinese and English names of the product, which must correspond to the HS code, such as "fresh longfin tuna" or "chilled longfin tuna". Condition: Indicate "fresh" or "chilled", and specify the storage temperature (e.g., 0-4°C) to distinguish from frozen storage. Latin Scientific Name: Fill in Thunnus alalunga to ensure correspondence with longfin tuna and avoid confusion with other tunas. Specifications: Describe by weight per fish or body length, such as "5-10 kg each", to facilitate customs statistics and valuation. Packaging Method: Specify inner packaging (e.g., foam boxes, plastic bags) and outer packaging (e.g., cartons), and indicate whether ice is included. Fishing Method: Fill in fishing or farming, such as "wild-caught" or "farmed"; some countries have quota requirements. Brand: If there is a brand, declare it; if no brand, fill in "none", used for customs intellectual property protection. Product Name: Fresh longfin tuna; Condition: Chilled (0-4°C); Latin Scientific Name: Thunnus alalunga; Specifications: 8-12 kg each; Packaging: Foam box, 2 fish per box, with ice; Fishing Method: Wild-caught, Fishing Area: Pacific Ocean; Brand: None; Use: For human consumption. Misreporting chilled as frozen, leading to incorrect classification under 0303. Failing to provide the Latin scientific name, making it impossible to prove it is longfin tuna. Not indicating ice in the packaging method, which may affect quarantine and classification.

The core basis for classification is the Import and Export Tariff and the HS Explanatory Notes: the product must be fresh or chilled whole fish, and the species must be longfin tuna (Thunnus alalunga). Key determination points include: 1) whether the preservation state is fresh/chilled; 2) whether it has undergone slicing, deboning or other processing (if sliced, classify under 0304); 3) species identification, which must be based on the Latin scientific name. Customs may require fishing certificates, species identification reports, etc. 030232 Fresh or chilled yellowfin tuna: Yellowfin tuna (Thunnus albacares) is similar in appearance to longfin tuna, but yellowfin tuna has yellow second dorsal and anal fins, while longfin tuna has particularly long pectoral fins. Accurate species identification is required for classification. 030234 Fresh or chilled bigeye tuna: Bigeye tuna (Thunnus obesus) has larger eyes and a rounder body, and can be distinguished from longfin tuna by pectoral fin length and body shape. 030236 Fresh or chilled southern bluefin tuna: Southern bluefin tuna (Thunnus maccoyii) is larger, with a silvery-white belly and shorter pectoral fins, and is an endangered species requiring CITES certification. 030239 Other fresh or chilled tunas: This subheading covers other species of the genus Thunnus not elsewhere specified, such as longtail tuna. If it cannot be identified as longfin tuna, it may be classified under this code. 030241 Fresh or chilled herring: Herring (Clupea harengus) is small and silvery-white, very different in appearance from longfin tuna, but may be confused if the declaration is vague. Confirm the product condition is fresh or chilled, not frozen. Verify whether the Latin scientific name is Thunnus alalunga. Check whether it has undergone slicing, deboning or other processing. Confirm whether the packaging method affects classification. Verify whether the fishing area involves quotas or endangered species.

How to inquire about the import tariff rate for 030231? You can check through the "Import and Export Tariff" on the official website of the General Administration of Customs of China, or use the "Customs Classification Pre-ruling" service. The tariff rate varies depending on trade agreements (such as RCEP) and country of origin, and must be determined in conjunction with the certificate of origin. How to distinguish longfin tuna from yellowfin tuna? Longfin tuna has particularly long pectoral fins, reaching more than 1/3 of body length, while yellowfin tuna has shorter pectoral fins and yellow second dorsal and anal fins. Customs may require a species identification report. What quarantine approvals are required for importing chilled longfin tuna? An "Import Animal and Plant Quarantine License" must be obtained, accompanied by an official quarantine certificate from the exporting country. Some countries also require fishing certificates or CITES import/export permits. What are the consequences if declared as 030231 but actually frozen fish? It may be deemed false declaration, facing supplementary taxes, fines, or even administrative penalties. Frozen fish should be classified under 0303, and the tariff rate and regulatory conditions may differ. Does 030231 apply to longfin tuna fillets? No. Fillets should be classified under 0304, and fresh or chilled fillets under 0304.31 (longfin tuna fillets). 030231 applies only to whole fish. How to declare cross-border e-commerce sales of fresh longfin tuna? It must be declared under general trade or cross-border e-commerce retail import, providing HS code 030231 and meeting quarantine requirements. Mailing as personal items may be restricted; consult local customs. Is longfin tuna an endangered species? Longfin tuna (Thunnus alalunga) is currently not listed in CITES appendices, but some regional fisheries management organizations have quota restrictions; stay updated on the latest policies. How to determine the boundary between "fresh" and "chilled" for longfin tuna in classification? Fresh means not frozen, maintaining its original temperature; chilled means stored at around 0°C to extend shelf life. Both are classified under 0302, but the temperature conditions must be truthfully stated during declaration.