Definition of prawn feed clarified and exchange-import rules for platinum rhodium bushings set out, affecting customs treatment. The notifications amend prior customs exemptions by defining 'prawn feed'-goods usable as prawn feed without alteration and with vitamin pre-mixes or vitamins by weight not exceeding SION for prawn feed in the Handbook of Procedures-and by adding entry 183A for platinum-rhodium bushings imported in exchange for exported worn-out bushings, with Annexure condition 28A linking duty liability to import within one year of export, absence of drawback on export, and a duty basis equal to exchange cost plus two-way insurance and freight.