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Figure 13


Fig. 13. Tow drag of a 18.5 cm cast of a black ghost knifefish at 10, 12 and 15 cm s–1. Error bars indicate standard deviation. The broken line shows drag when towing the fish tail first. Values are slightly horizontally offset to show the standard deviation bars. Solid gray line indicates thrust values estimated from Blake (Blake, 1983) for a 15 cm Xenomystus nigri, a knifefish with a body shape similar to that of the black ghost knifefish.





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