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Background  Enhanced food-finding efficiency is an obvious adaptive response to cave environments. Here, we have compared the food-finding abilities of  Astyanax  surface fish and blind cavefish young larvae in their first month of life, in the dark.    Results  Our results show that enhanced prey capture skills of cavefish are already in effect in fry soon after the yolk is depleted and the young larvae must find food for themselves. Moreover, using prey capture competition assays on surface fish fry with lensectomies, we showed that eye-dependent developmental processes are not the main determinant for enhanced prey capture skills. Finally, using F 2  hybrid larvae resulting from crosses between surface fish and cavefish, we found that reduced eyes do not confer a selective advantage for prey capture by fry in the dark.    Conclusion  We discuss these data with regards to our current developmental and genetic understanding of cavefish morphological and behavioral evolution.

Enhanced prey capture skills in Astyanax cavefish larvae are independent from eye loss