Ou River (Zhejiang) two alien species (Mozambique tilapia and largemouth bass); however, 34 species recorded in 1972 were absent in 2010, and overall fish density was lower. Goby "Pseudorhinogobius aporus" is endemic to the Ou River system: it is only known from a brook in the upper Ou River system. Ou River (Zhejiang) The Ou River () or Oujiang is the second-largest river in the Zhejiang province of eastern China. The river flows before finally reaching the city of Wenzhou and emptying into the East China Sea, into which it discharges of water annually. Shen Jiang (), Jiang Yongjia (), and Wenjiang ()
Time-Place learning cues from the food itself, but use instead a learned association between daily time and place. In fish, time-place learning has been demonstrated in the golden shiner and the inanga. Golden shiners could be taught to seek food in one half of their aquarium in the morning, in the other half at midday, and back to the first half in the afternoon. They maintained this spatio-temporal pattern even when food was withheld on test days. The spatio-temporal pattern also shifted gradually over several days when the day-night cycle was suddenly shifted early by 6 h, as is typical of circadian