■ We don’t yet know if demand for shark fin soup is diminishing in all of the major importing countries, including Mainland China itself, or whether this phenomenon is limited to Hong Kong.
■ We don’t really know how much this vast trade needs to be reduced to enable most shark populations to recover.
■ And, of course, demand for shark meat remains high in many parts of the developing world and demand for shark fin soup, or another, new shark product, could always pick up again in Asia or elsewhere.