"He... became interested in the behaviour of trout and salmon in mountain streams. The... trout could lie motionless... in the strongest current. ...He ...organized his woodsmen to warm up about 100 litres of water and pour this in ...upstream ...The meagre 100 litres ...did not noticeably warm up the stream. However, ...the trout ...until then ...motionless ...was only with considerable effort able to maintain its position. This convinced Schauberger... that there was ...a connection between the water's temperature and the trout's behaviour. ...[A]lso ...the trout's ability to jump up high waterfalls with little apparent effort. ...[H]e saw evidence for his theory that the trout exploited some hitherto unknown source of energy within the water."