There is nothing to fear but fear itself.
Impossible to make world SPF.
Which is why initially it failed with vannamei shrimp and was re-branded shrimp high health for the commodity mass market.
We all know the development of the US led shrimp SPF and the French led shrimp SPR (plus other sub derivatives up to APE) programs.
SPF (type of quaranteen and self isolation) is all about survival. More elitist but grow out isolated in climate controlled and genetically manipulated environments.
SPR is about developing resistance rather than exclusion.