Abstract
A straight‐channel stream simulator consisting of a pool‐riffle sequence with gravity flow from a nearby stream is described. The facility has a food‐producing channel at the upstream end to augment the natural food supply for fish used in experiments, and a riffle with an adjustable slope to simulate a range of stream gradients; both are new features. The simulator has proved to be a valuable tool in gaining insight into the biology and interactive ecology of small fishes.

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