Mutual-fund firms rocked by asset decline Stock and bond funds take major hit; record outflows in October By Sam Mamudi, MarketWatch Last update: 2:28 p.m. EST Nov. 25, 2008NEW YORK (MarketWatch) -- After seeming to weather the worst of the credit storm, the mutual-fund industry has been getting walloped, losing more than 20% of assets under management in just five months. Data from research firm Lipper show that as of Oct. 31, mutual funds of all types -- stock funds, bond funds and money market funds -- had $9.5 trillion in assets. That's a 20.8% drop from where the industry...