In the last trading session, U.S. stocks ended in the red after three days of gains as oil prices retreated and global growth worries resurfaced. Among the top ETFs, investors saw SPY go down 0.14%, DIA  lose 0.10% and (QQQ - ETF report) decline 0.16% 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:

(VONV - ETF report) : Volume 4.50 times average

This U.S. large-cap value ETF was in focus yesterday as roughly 155,000 shares moved hands compared to an average of roughly 34,000 shares. We also saw some stock price movement as VONV lost 0.14%.

The movement can largely be blamed on heightened risk-off trade sentiment brought on by the slump in U.S. stocks that can have a big impact on the large-cap value stocks like what we find in this ETF’s portfolio. VONV was up 3.8% in the past one month and has a Zacks ETF Rank of 2 or ‘Buy’ rating with a Medium risk outlook.

(JO - ETF report) : Volume 3.10 times average

This coffee ETN was in focus yesterday as nearly 722,000 shares moved hands compared to an average of roughly 233,000 shares. We also saw some price movement as JO lost nearly 4.1% yesterday.

The move yesterday was largely the result of correction in coffee prices, which were riding high on speculations about supply issues. For the past one-month period, JO was up 9%. The fund has a Zacks ETF Rank of 4 or ‘Sell’ rating with a High risk outlook.