Dec 16 Ecovix Engevix Construcoes Oceanicas SA and five subsidiaries have filed for bankruptcy protection in a federal commercial court, succumbing to a debt burden of 8 billion reais and a plunge in shipbuilding. In a statement on Friday, Ecovix said Banco Brasil Plural SA and law firm Felsberg Advogados will advise it on bankruptcy protection proceedings, which will take place in a court based in the southern Brazilian state of Rio Grande do Sul.