BUENOS AIRES, June 8 (Reuters) - Argentina's stock, bond and currency market trends on Monday.
* The MerVal stocks index .MERV slipped 0.78 percent to 1,625.26 points, hurt by falling oil prices and thin trade volume.
* Shares in Tenaris (TENA.BA), which makes steel pipes for the energy industry and is weighted as almost half of the MerVal, fell 1.5 percent to 58.70 pesos per share.
* On the broad stock market, volume was weak at $9.8 million. Of active issues, 30 advanced, 38 declined and 16 were unchanged.
* Prices for government bonds traded over-the-counter in Buenos Aires fell 0.4 percent on average, reducing gains since June 1 to about 5.5 percent.
* The 2038 Par bond denominated in pesos ARPARP=RASL shed 3.3 percent to an ask price of 20.70.
* Traders said speculation about a possible interest rate rise in the United States dampened appetite for Argentine debt among institutional investors. Riskier assets tend to fall out of favor when U.S. rates rise.
* In formal exchange between banks, the peso weakened by 0.07 percent to 3.7575/3.76 per dollar ARS=RASL.
* In informal trade between foreign exchange houses, as measured by Reuters, the peso ended unchanged at 3.8025/3.8075 ARSB=. (Reporting by Walter Bianchi; Writing by Hilary Burke; Editing by Dan Grebler)