Figure 2 from: Sampaio FAC, Rufino MS, Pompeu PS, Santos HA, Ferreira RL (2020) Hydraulic flow resistance of epigean and hypogean fish of the family Trichomycteridae (Ostariophysi, Siluriformes). Subterranean Biology 35: 97-110. https://doi.org/10.3897/subtbiol.35.55064

Figure 2 Experimental apparatus for testing fish swimming capacity and resistance to flow: A centrifugal pump which creates the water flow B central testing section C connection for fish entrance to and removal from the central testing section D screens to keep fish in the central testing section E flow rate gauge F frequency converter which was used to change pump rotation and, consequently, the flow velocity in the central testing section G water tank and H water cooler.