Drag coefficient estimates from coasting bluegill sunfish Lepomis macrochirus

Abstract

The drag coefficient bluegill sunfish Lepomis macrochirus was estimated from coasting deceleration as (mean ± SD) 0.0154 ± 0.0070 at a Reynolds number of 41,000 ± 14,000. This was within the coasting range in other species and lower than values obtained from dead drag measurements in this species and others. Low momentum losses during coasting may allow its use during intermittent propulsion to modulate power output or maximize energy economy.

Swimming from coast to coast: a novel fixed-gear swimming gait in fish

“…Sustained swimming tracks where fish traversed more than half the tank length consisted of alternating bouts of BCF propulsion and coasting similar to those previously observed in bluegill in a large static tank [21] (example video files, electronic supplementary material).…”

“…Changes in tail beat frequency with average speed were best described by a segmented regression with a break point at 0.24 + 0.01 ms 21 (+ 95% CI, figure 1a). The AIC for the segmented mixed model of 279 indicated a substantially better fit to the data than a linear mixed model (AIC, 540).…”

Swimming behavior and hydrodynamics of the Chinese cavefish Sinocyclocheilus rhinocerous and a possible role of its head horn structure

“…rhinocerous and S . angustiporus were scanned to generate 3-D models ( Fig 1B and 1D , respectively) which were used (1) to simulate the flow field around the fish body during coasting swimming in open water and (2) to calculate both the pressure-related stimulus to the lateral system and the drag force like previous study [ 53 ]. For model simulations, this was a simulated flow that was continuously on and not a real flow in a flow channel, and the fish’s body was aligned such that the head faced the incoming flow.…”