NEW YORK (AP) _ Bond prices opened stronger today but fell back after several hours of trading as the dollar eased against some major foreign currencies.

The Treasury's closely watched 30-year bond was down 1-16 point, or about 63 cents per $1,000 in face amount, while its yield rose to 8.83 from 8.82 percent late Monday.

Corporate and municipal issues were unchanged to slightly hiher.

The dollar was easing against most currencies in quiet early trading in New York, where it was lower against the Japanese yen compared with Monday's close.

Analysts said the mood in the bond market continued to be bearish. ''Whatever news comes out is reacted to pretty bearishly,'' said Kathy Camilli, an economist at Drexel Burnham Lambert Inc.

Camilli said bond prices firmed overnight in Tokyo ''due to buying by a Japanese insurance company.'' And while there seemed to be an initial follow- through in activity domestically, ''the market has come off,'' she said at mid-morning.

Randy Strausberg, a senior vice president in the fixed-income division at Nikko Securities Co. International Inc., said there was some retail buying and ''a little bit of bottom-fishing by investors ... particularly as we start getting closer to 9 percent'' on the 30-year Treasury bond.

He also pointed to the market's concern over having to take on a heavy amount of supply once lawmakers approve an increase in the debt ceiling, a move that will allow the Treasury Department to go ahead with previously postponed bond auctions.

Many traders are concerned that there will be a deluge of new debt securities when the legislation is finally approved, and that the market may not be able to handle the increased supply.

In the secondary market for Treasury bonds, prices of short-term governments were 1-32 point lower, intermediate maturities were unchanged to 3-32 lower and and 20-year issues were down 1/8 point, according to figures provided by Telerate Inc.

The movement of a point is equivalent to a change of $10 in the price of a bond with a $1,000 face value.

The Merrill Lynch Daily Treasury Index, which measures price movements on all outstanding Treasury issues with maturities of a year or longer, fell 0.02 to 111.48. The Shearson Lehman Daily Treasury Bond Index, which makes a similar measurement, was up 0.77 to 1,166.36.

In corporate trading, industrials and utilities were unchanged in light trading, according to the investment firm of Salomon Brothers Inc.

Moody's Investment Grade Corporate Bond Index, which measures price movements on 100 corporate bonds with maturities of five years or longer, rose 0.29 to 263.60.

Among tax-exempt municipal bonds, general obligations were unchanged in light activity while dollar bonds were up 1/4 point in moderate trading, Salomon Brothers said.

Yields on three-month Treasury bills were up 8 basis points to 5.87 percent. A basis point is one-hundredth of a percentage point. Six-month bills rose 7 basis points to 6.08 percent and one-year bills rose 2 basis points to 6.37 percent.

The federal funds rate, the interest on overnight loans between banks, traded at 6 9-16 percent, unchanged from late Monday.