(Bloomberg) -- Tension is building on Wall Street as fixed- income profits fall.

Big banks are struggling to lift falling debt-trading revenues, with Deutsche Bank saying that it expects industrywide profits to fall further this year. But the fixed-income trade is booming at BlackRock and other investment firms, which are capturing a greater amount of activity -- and fees -- with their ballooning credit ETF businesses. The banks are now angling to steal some of that business back.

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