The article announces the commencement of the blue cod fishing season in the Marlborough region, emphasizing the importance of adhering to fishing regulations to ensure the species' sustainability. Fisheries New Zealand has encouraged the public to follow the daily catch limit of two per person and the minimum size limit of 33cm. Additionally, the article outlines other rules such as whole or gutted fish possession limits and the use of the free NZ Fishing Rules mobile app for fishermen. The public is also urged to report any suspicious fishing activities anonymously to protect the fisheries.