** Shares of Indian seafood exporters rise between 2.55% and 4.68%
** Coastal Corporation COAS.NS up 2.55%, Apex Frozen Foods APEX.NS rises 4.51% and Avanti Feeds AVNT.NS gains 4.68%
** APEX set for best day in nearly 8 years; AVNT jumps to record
** The U.S. Supreme Court struck down Donald Trump's global tariffs in February; a tariff refund system went live on Monday to allow companies which export to the U.S. to recover illegally collected tariffs
** The U.S. is the biggest market for India's shrimp farmers and exporters
** YTD, COAS up 14.5%, AVNT up 88.6%, APEX up 80.5%
(Reporting by Abhirami G in Bengaluru)
((abhirami.g@thomsonreuters.com))