Provided are a device and associated method for simulating natural hydraulic cues received instinctively by waterborne fauna. A tubular glide housing includes a rectangular seal enclosure having a top wall, a bottom wall, an outwardly located side wall, and an inwardly located side wall defining a passage extending through the enclosure. The transmitter and the receiver are directed onto at least one common surface, which reflects the light emitted from the transmitter before it reaches the receiver. A method of article accumulation at substantially a predetermined level is also disclosed. Treasury Auction cycle and the difference between a resultant industry surveyed swap rate and a resultant industry surveyed swap spread of the respective tenors of the on-the-run treasury futures.