In the last trading session, Wall Street delivered a downbeat performance. Among the top ETFs, (SPY Quick QuoteSPY - Free Report) lost 0.7%, (DIA Quick QuoteDIA - Free Report) retreated 0.4% and (QQQ Quick QuoteQQQ - Free Report) was down 0.4%.

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.

(CGW Quick QuoteCGW - Free Report) : Volume 3.54 Times Average

This water ETF was in the spotlight as around 194,500 shares moved hands compared with an average of 54,960 shares a day. We also saw some price movement as CGW lost 1.7% in the last session. CGW has declined 3.8% over the past month.

(DZZ Quick QuoteDZZ - Free Report) : Volume 3.16 Times Average

This gold double short ETN was under the microscope as nearly 58,900 shares moved hands. This compared with an average trading volume of roughly 18,660 shares and came as DXJ gained 1.4% in the last trading session. DZZ has gained 3% in a month’s time.