It is the policy of the state, under AS 16.10.500 - 16.10.560, to promote the enhancement of the state's fisheries by means of grants for organizational and planning purposes to regional associations described in AS 16.10.510 that have qualified under AS 16.10.380, and by means of long-term, low interest loans for hatchery planning, construction, and operation and for planning and implementation of enhancement and rehabilitation activities including, but not limited to, lake fertilization and habitat improvement.