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 memory. The first evidence for time-place learning in animals came from studies in the 1930s on honeybees, which could be trained to visit two different feeders, one in the morning and the other in the afternoon. Subsequent work in the 1980s showed that only a few individuals in the colony were able to learn that task, and did so with more precision for the morning than for the afternoon feeding. Honeybees can also be trained to recognize one visual pattern to obtain food in the morning, and another pattern to get food in the afternoon; when presented with both patterns