More Americans filed for bankruptcy protection in March than during any month since the federal personal bankruptcy law was tightened in October 2005, a new report says, a result of high unemployment and the housing crash.

Federal courts reported over 158,000 bankruptcy filings in March, or 6,900 a day, a rise of 35 percent from February, according to a report to be released on Friday by Automated Access to Court Electronic Records, a data collection company known as Aacer. Filings were up 19 percent over March 2009. The previous record over the last five years was 133,000 in October.

“Even with the restrictive new law, we’re back up over where we were before the law changed,” Mike Bickford, president of Aacer, said in a phone interview Thursday from his headquarters in Oklahoma City. He faulted the stagnant economy, saying a surge in bankruptcies generally follows economic contraction by 6 to 18 months, and he pointed to March as a historically busy month for bankruptcy filings.

Other experts point out that filings invoking Chapter 7 of the bankruptcy code, a simple and inexpensive option, are rising faster than more complex Chapter 13 reorganization filings, under which consumers repay a portion of their debts so they can keep their homes, suggesting that more homeowners are simply walking away from underwater mortgages.