On our way back we find the female fish jogging along another road in town.
 

The strange thing is when we drive back by where the boy fish was earlier...He's gone! Somehow in the two hours since we had passed him someone had come along and taken him away. All that's there is the stand he had been on and some random screws that got left behind. Someone stole the jogging fish!

Either that or he finished the race and went home.