Common carp were part of this study that looked at the dynamics of scales and drag for airlines.  Scale design may provide significant saving in fuel for planes. 
 
The team's findings have been published in Nature: Scientific Reports: "Transition delay using biomimetic fish scale arrays," and in the Journal of Experimental Biology: "Streak formation in flow over biomimetic fish scale arrays."
Reducing drag means faster aircraft speeds and less fuel consumption—an important area of study for aerodynamicists...
 
https://phys.org/news/2020-10-aerodynamicists-reveal-link-fish-scales.html