Currently, the secretary of state for nature is actually cross-appointed to four different ministers who have a role in delivering on the nature agenda.
With respect to the Species at Risk Act, for terrestrial species, the responsibilities for the act rest currently with the Minister of Environment. Aquatic species are the responsibility of the Minister of Fisheries. There is a close collaboration between those two ministers on the implementation of the act, but that is more or less how the act is distributed.