944f210d___Changes_in_Fish_Species
[Decade] 1920 [Market Stimulation] Kolbe family of Port Dover developed a better way of freezing fresh fillets, allowing access to larger markets [Fishing Technology] gasoline tugs were replaced by economical diesel powered tugs -introduction of steel hulled fishing boats [Changes in Fish Species] 
-Lake Herring catch fell drastically in 1925 -Yellow Perch started to become commercially important
Changes in Fish Species