The mesotrophic, dimictic lakes are important recreational
fishing sites for both warm-water bass and cold-water trout. To improve summertime cold-water habitat for
trout in NT, dissolved oxygen (DO) addition to the hypolimnion, using liquid oxygen as an oxygen gas source,
started in 2009. This study assessed mercury (Hg) in the water column, zooplankton and fish, and related
water quality parameters, inTwin Lakes from2009 to 2012