The department shall:
(a)
Gather and prepare data of the commercial fisheries, showing particularly the extent of the fisheries and the extent to which the various species abound.
(b)
Make such investigations of the biology and the environment of the living marine resources as will aid in the collection and preparation of the statistical information necessary to determine the population dynamics of the species relative to their scientific management.
(c)
Make such investigations as
will disclose the optimum sustainable yield of the various marine resources.
(d)
Determine what measures may be advisable to conserve any fishery, or to enlarge and assist any fishery where that may be done without danger to the supply.