Exhibit 99.1

Anworth Announces Increase to Series B Preferred Stock Conversion Rate

SANTA MONICA, Calif.--(BUSINESS WIRE)--April 10, 2012--Anworth Mortgage Asset Corporation (NYSE: ANH) announced today that, in accordance with the terms of Anworth’s 6.25% Series B Cumulative Convertible Preferred Stock, or Series B Preferred Stock, the conversion rate of the Series B Preferred Stock will increase from 3.6714 shares of Anworth’s common stock to 3.7329 shares of its common stock effective April 11, 2012.

As previously announced on March 30, 2012, the board of directors declared a quarterly common stock dividend of $0.21 per share, which is payable on April 27, 2012 to holders of record of common stock as of the close of business on April 10, 2012. When Anworth pays a cash dividend during any quarterly fiscal period to its common stockholders in an amount that results in an annualized common stock dividend yield greater than 6.25% (the dividend yield on the Series B Preferred Stock), the conversion rate on the Series B Preferred Stock is adjusted based on a formula specified in the Articles Supplementary Establishing and Fixing the Rights and Preferences of the Series B Preferred Stock (and also available on the “Series B Pfd. Stock Conversion” page of Anworth’s web site at http://www.anworth.com). As a result of this dividend, the conversion rate will increase from 3.6714 shares of Anworth’s common stock to 3.7329 shares of its common stock effective April 11, 2012.

About Anworth Mortgage Asset Corporation

Anworth is a mortgage real estate investment trust which invests primarily in securities guaranteed by the U.S. Government, such as Ginnie Mae, or guaranteed by federally sponsored enterprises, such as Fannie Mae or Freddie Mac. Anworth seeks to generate income for distribution to shareholders primarily based on the difference between the yield on its mortgage assets and the cost of its borrowings. The Company is managed by Anworth Management, LLC, or the Manager, pursuant a management agreement. The Manager is subject to the supervision and direction of the Company’s Board of Directors, and is responsible for (i) the selection, purchase and sale of the Company’s investment portfolio; (ii) the Company’s financing and hedging activities; and (iii) providing the Company with management services and other services and activities relating to the Company’s assets and operations as may be appropriate. The Company’s common stock is traded on the New York Stock Exchange under the symbol “ANH.”

Safe Harbor Statement under the Private Securities Litigation Reform Act of 1995

This news release may contain forward-looking statements within the meaning of the "safe harbor" provisions of the Private Securities Litigation Reform Act of 1995. Forward-looking statements are based upon our current expectations and speak only as of the date hereof. Forward-looking statements, which are based on various assumptions (some of which are beyond our control) may be identified by reference to a future period or periods or by the use of forward-looking terminology, such as “may,” “will,” “believe,” “expect,” “anticipate,” “assume,” “estimate,” “intend,” “continue,” or other similar terms or variations on those terms or the negative of those terms. Our actual results may differ materially and adversely from those expressed in any forward-looking statements as a result of various factors and uncertainties, including but not limited to, changes in interest rates; changes in the market value of our mortgage-backed securities; changes in the yield curve; the availability of mortgage-backed securities for purchase; increases in the prepayment rates on the mortgage loans securing our mortgage-backed securities; our ability to use borrowings to finance our assets and, if available, the terms of any financing; risks associated with investing in mortgage-related assets; changes in business conditions and the general economy, including the consequences of actions by the U.S. government and other foreign governments to address the global financial crisis; implementation of or changes in government regulations affecting our business; our ability to maintain our qualification as a real estate investment trust for federal income tax purposes; our ability to maintain an exemption from the Investment Company Act of 1940, as amended; and the Manager’s ability to manage our growth. Our Annual Report on Form 10-K and other SEC filings discuss the most significant risk factors that may affect our business, results of operations and financial condition. We undertake no obligation to revise or update publicly any forward-looking statements for any reason.

CONTACT:
Anworth Mortgage Asset Corporation
John T. Hillman
310-255-4438 or 310-255-4493
jhillman@anworth.com
http://www.anworth.com