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(Positive) Rheotaxis is a form of taxis seen in many aquatic organisms, e.g., fish, whereby they will (generally) turn to face into an oncoming current. This has been noted in zebrafish and other species.〔(Pub Med Central search results ). Accessed March 30, 2009.〕〔(Google Scholar Search ). Accessed March 30, 2009.〕 In a flowing stream, this behavior leads them to hold position in a stream rather than being swept downstream by the current. In fish that exhibit rheotaxis, it can easily be demonstrated by creating an artificial current within a tank using pumps. No matter which way the pumps force the current to flow, the fish will immediately turn to face the oncoming current. Some fish will exhibit negative rheotaxis where they will avoid currents.〔(Google Scholar Search ). Accessed March 30, 2009.〕 Some zooplankton also exhibit positive or negative rheotaxis. Positive rheotaxis is found in most major aquatic invertebrate groups. ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Rheotaxis」の詳細全文を読む スポンサード リンク
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