Figure 3From: Atlantic cod actively avoid CO2 and predator odour, even after long-term CO2 exposureChoice flume chamber experimental setup with pCO 2 control and predator cues on one side. Choice flume test. Schematic drawing of the choice flume test used for predator avoidance measurements in juvenile cod. The shaded areas represent water with predator odour. The letters represent the following: A. Flow-through water inlet. B. Main header tank. C. pH-stat system with pH probe and solenoid valve controlling the administration of CO2 into the main header tank. D. Header tanks for the two sides of the choice flume, with one side containing a predatory fish. E. Cross-over piping for changing sides of the cue. F. Honeycomb plastic for laminar flow. G. Choice arena for the tested fish. The two waters were kept separate by laminar flow, and movements only caused minimal short lasting mixing. H. Flume drains.Back to article page