Customs exemption for prawn feed limits payable duty to a 25% ad valorem equivalent and waives additional duty. The notification exempts prawn feed classified under sub headings 2301.20 or 2309.90 from customs duty in excess of an amount calculated at 25 per cent ad valorem and from the whole of the additional duty otherwise leviable under section 3, on imports into India, effected as a public interest exemption.