A survival guide for feeble fish
  As avid anglers we were always interested in the survival chances of fish in turbulent oceans. This paper addresses this question mathematically. We show that a fish with bounded aquatic locomotion speed can reach any point in the ocean if the fluid velocity is incompressible, bounded, and has small mean drift. 
Dmitri Burago, Sergei Ivanov, Alexei Novikov
math.OC math.AP math.MG