O'Connor flags changes to 457 visa laws IMMIGRATION Minister Brendan O'Connor says breaches of the 457 foreign worker visa program have been so serious that legislative change will be needed. Mr O'Connor released figures on Sunday that showed the number of 457 visas granted had fallen between January and March this year. But he said there had been a 19 per cent increase in the number of visa holders in March this year compared with the same month in 2012. He acknowledged he did not know precisely how many breaches of the scheme there had been, but said it could "exceed over 10,000" cases. "I think it's a very significant breach of the scheme," Mr O'Connor told Sky News on Sunday. He said he will be introducing legislation when parliament resumes in May to reform the program. "I've always said there's a combination of reforms - we'd look at administrative, regulatory and legislative," he said. I am yet to determine what parts of the reforms would be introduced in legislation but I can assure you we will be looking to legislate. The figures from immigration department showed there were 105,600 457 visa holders in Australia in March this year. "The rate of growth is still continuing," Mr O'Connor said. By the end of the next parliamentary term if it was left unamended, there will be 350,000 new 457 applicants in the country. The average base salary for 457 visa holders was $55,000 for accommodation and food services workers and $69,000 for retail staff.