In the last trading session, U.S. stocks ended on a weaker note, thanks to renewed global growth worries set off by disappointing manufacturing data in China, weaker growth forecast for Europe and plunging oil prices. Among the top ETFs, investors saw SPY go down 0.87%, DIA plunge 0.78% and QQQ decline 0.93% on the day. Two more specialized ETFs are worth noting as both saw trading volume that was far outside of normal. In fact, both these funds experienced volume levels that were more than double their average for the most recent trading session. This could make these ETFs the ones to watch out for in the days ahead to see if this trend of extra-interest continues: IDX: Volume 4.38 times average This Indonesia-focused ETF was in focus yesterday as around 306,000 shares moved hands compared with an average of roughly 70,000 shares a day. We also saw some price movement as IDX lost nearly 2% last session. The movement can largely be blamed on Indonesia’s gross domestic product growing at a slower-than-expected pace in the first quarter of 2016, which can have a big impact on Indonesian stocks like what we find in this ETF portfolio. IDX was down almost 4.8% over the past one-month and currently has a Zacks ETF Rank of 3 or ‘Hold’ rating with a High risk outlook. EZU: Volume 2.48 times average This Eurozone ETF was under the microscope yesterday as nearly 13.9 million shares moved hands. This compares to an average trading volume of 5.6 million shares and came as EZU fell 2% in the session. The big move came in as the European Commission predicted that the yearly growth in the Eurozone along with the wider European Union will be weaker than the earlier forecast. In the last one-month period, EZU was up about 2.1% and currently has a Zacks ETF Rank of 3 with a Medium risk outlook. 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 >>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 VANECK-INDONES (IDX): ETF Research Reports ISHARS-EMU IDX (EZU): ETF Research Reports SPDR-SP 500 TR (SPY): ETF Research Reports NASDAQ-100 SHRS (QQQ): ETF Research Reports SPDR-DJ IND AVG (DIA): ETF Research Reports To read this article on Zacks.com click here. Zacks Investment Research 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