Fig. 1: Application of the SRT to a specified aquaculture scenario.

Stepwise progression requires a clear definition of the scenario to which the SRT is being applied (1) followed by the formation of a customized hazard list relating to the major CH, AH and HH hazard categories likely to interact with specific phases of supply (2 and 3). The SRT is initially applied to the uncontrolled state (4) where no mitigations are applied. By considering the role of phase-specific control options identified within the RMM (5), the SRT can be re-applied to this controlled state (6), repeating, if necessary, with different control combinations. The outturn is a biosecurity and seafood safety plan (7) that assists a decision to progress, amend or reject the aquaculture scenario in fulfilling its goal, as initially stated (8). CH1, heavy metals; CH2, persistent organic pollutants; CH3, radiological contaminants; CH4, natural biotoxins; CH5, veterinary, pharmaceutical and personal care chemicals; CH6, allergens; AH1, viral pathogens; AH2, bacterial pathogens; AH3, protistan pathogens; AH4, metazoan pathogens; AH5, syndromes; HH1, environmental pathogens; HH2, anthropogenically derived pathogens; HH3, zoonotic pathogens. See Table 1 for descriptions and examples of specific hazard types and their mode of interaction with seafood and Supplementary Section 2.1 for examples of hazard interaction with, and impact on, different seafood species groups. The spider diagram profiles represent the hypothetical risk profile when hazards are not controlled (red border) and when controls are applied (green border) throughout the supply chain for the scenario under consideration.