Alternative assets under management fell 37.25% from a year earlier, to $2.496 trillion as of March 31, according to a survey released Tuesday.

Carbon360 Research's fourth annual fund administration fact book attributed the decline to poor investment performance and investor redemptions.

According to the survey, 28% of the decline occurred during the second, third and fourth quarter last year and 9.25% came in the first quarter of this year.

Carbon360 forecasts that alternative assets under management will continue to decline this year. The company predicts a total decline, including that of the first quarter, of 18.5% this year.

The survey said among the 25 largest third-party fund administrators, single-manager hedge fund assets under administration fell 26%, to $2.1 trillion, from March 31, 2008, to March 31, 2009.

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