(a) The commission may increase or decrease the optimum number of entry permits for a fishery when one or more of the following conditions makes a change desirable considering the purposes of this chapter:
(1) an established long-term change in the biological condition of the fishery has occurred that substantially alters the optimum number of entry permits permissible applying the standards set out in AS 16.43.290;
(2) an established long-term change in market conditions has occurred, directly affecting the fishery, that substantially alters the optimum number of entry permits permissible under the standards set out in AS 16.43.290.
(b) If the commission decreases the optimum number of entry permits for a fishery, the number of entry permits may be reduced only under the voluntary buy-back provisions set out in AS 16.43.310 and 16.43.320.