Heritable variation in swimming performance in Nile tilapia (Oreochromis niloticus) and negative genetic correlations with growth and harvest weight.

Nile tilapia is predominantly produced in smallholder ponds without aeration. We hypothesize that Nile tilapia with high oxygen uptake efficiency (OUE) may perform better under these conditions than Nile tilapia with low OUE. Critical swimming speed (U, in cm s) is a potential indicator for OUE.