zebrafish larvae exhibit rheotaxis and can escape a continuous suction source using their lateral line斑马鱼幼体展览窃,可以摆脱连续抽吸源用侧线.pdfVIP

Zebrafish Larvae Exhibit Rheotaxis and Can Escape a Continuous Suction Source Using Their Lateral Line 2. 1. 1 1 Julia Olszewski , Melanie Haehnel , Masashige Taguchi , James C. Liao * 1 Department of Biology, The Whitney Laboratory for Marine Bioscience, University of Florida, Saint Augustine, Florida, United States of America, 2 Department of Ecology and Evolutionary Biology, Brown University, Providence, Rhode Island, United States of America Abstract Zebrafish larvae show a robust behavior called rheotaxis, whereby they use their lateral line system to orient upstream in the presence of a steady current. At 5 days post fertilization, rheotactic larvae can detect and initiate a swimming burst away from a continuous point-source of suction. Burst distance and velocity increase when fish initiate bursts closer to the suction source where flow velocity is higher. We suggest that either the magnitude of the burst reflects the initial flow stimulus, or fish may continually sense flow during the burst to determine where to stop. By removing specific neuromasts of the posterior lateral line along the body, we show how the location and number of flow sensors play a role in detecting a continuous suction source. We show that the burst response critically depends on the presence of neuromasts on the tail. Flow information relayed by neuromasts appears to be involved in the selection of appropriate behavioral responses. We hypothesize that caudally located neuromasts may be preferentially connected to fast swimming spinal motor networks while rostrally located neuromasts are connected to slow swimming motor networks at an early age. Citation: Olszewski J, Haehnel M, Taguchi M, Liao JC (2012) Zebrafish Larvae Exhibit Rheotaxis