MADRID, June 28 (Reuters) - Indebted Spanish fishing firm Pescanova PVA.MC , which filed for insolvency in April, said on Friday it had obtained a 56- million-euro ($73 million) syndicated loan to cover its urgent financing needs. Spain's largest banks were all involved in the syndicate, it said in a regulatory filing. Pescanova's insolvency filing mentioned debts of 1.5 billion euros but financial sources have said that total debt is probably more than double that amount. (Full Story ($1 = 0.7691 euros) (Reporting by Tracy Rucinski; Editing by Clare Kane) ((tracy.rucinski@thomsonreuters.com)(+34 91 585 2153)(Reuters Messaging: tracy.rucinski.thomsonreuters.com@reuters.net)) Keywords: PESCANOVA LOAN/