Over supply happens because we don't have a reliable measurement of demand to base our production on. Demand has traditionally been extremely poorly estimated with slow, out of sync, paper-based processes. Now that information can be relayed instantaneously.

Perhaps a smart demand system which measures current and future demands for fish based on information input directly (P2P) from the end-user to the supply network, using some sort of utility model (which would factor in diminishing returns per user), could keep demand and supply in better balance.