This Costa Rican official-gazette source publishes Decreto Ejecutivo No. 34687-MAG, RTCR 409:2008, which sets maximum microbiological, veterinary-drug-residue, and contaminant limits for fishery and aquaculture products and subproducts intended for human consumption.
The routeable heavy-metal rows are in section 3, “Contaminantes quimicos.” Section 3.1 lists mercury limits for fishery products, section 3.2 lists cadmium limits, section 3.3 lists lead limits, and section 3.4 lists a tin limit for canned fishery products. The source heading says mercury without a methylmercury qualifier, so HMI records those rows as tHg rather than MeHg.
Values are recorded in the structured evidence record in ug/kg, converted from the source’s mg/kg limits by multiplying by 1000. The source table does not state a wet-weight or dry-weight qualifier, so the structured rows preserve the legal basis as product placed on the market and note the missing wet/dry qualifier.
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