In the last trading session, U.S. stocks were mostly in the green. A better-than-expected July job report following a strong June report mainly moved the market along with earnings releases. Among the top ETFs, investors saw (SPY Quick QuoteSPY - Free Report) gain about 0.8%, (DIA Quick QuoteDIA - Free Report) and (QQQ Quick QuoteQQQ - Free Report) gain about 1% each on the day.

Two more specialized ETFs are worth noting in particular though as both saw trading volume that was far outside of normal. In fact, in the most recent trading session, both these funds experienced volume levels that were more than double their average. This could make these ETFs the ones to watch out for in the days ahead to see if this trend of extra interest continues:

: Volume 3.19 times average

This short-term U.S. corporate bond ETF was under the microscope on Friday as nearly 2.05 million shares moved hands. This compares to an average trading volume of 643,800 shares and came as SCPB lost about 0.05% in the session.

The movement can largely be credited to thestronger job report in back-to-back months, which raised the odds of a Fed rate hike in the near term. This pushed up the short-term U.S. Treasury bond yields. In the last one-month period, SCPB was down about 0.1%. The fund has a Zacks ETF Rank #3 (Hold).

(RWJ Quick QuoteRWJ - Free Report) : Volume 2.85 times average

This small-cap revenue ETF was in focus Friday as roughly 55,000 shares moved hands compared with an average of roughly 19,200 shares.

The stronger job report points to a rebounding U.S. economy. Since small-caps are mostly tied to the domestic economy, RWJ garnered investor attention.In the last one-month period, RWJ was up 7.2%. The fund has a Zacks ETF Rank #3.

Want the latest recommendations from Zacks Investment Research? Today, you can download 7 Best Stocks for the Next 30 Days.Click to get this free report >>