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 enter one arm of a maze in the morning and another in the afternoon, though only 63% of the animals could attain the criterion of nine correct choices over ten consecutive trials. In a protocol not based on food acquisition, rats swimming in a tank could learn the location of one resting platform in the morning, and another in the afternoon. However, other studies have failed to find evidence of time-place learning in rats. Outcomes of time-place tests with rats seem to depend on what behaviors are measured to assess learning, and on the (sometimes too low) costs of not