If you don't have a live well, you can use an aquarium battery operated air pump to aerate them in a cooler with an bubbling air stone.
Got to change water as often as possible.
At home, do the same but with an electric aquarium air pump.

Give them a 100% water change just before you pull your boat up.

You can find these air pumps in Wal Mart or Pets Mart.

P.S. don't go cheap with the battery operated air pump and bring extra batteries.

Good Luck.
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Know fish or no fish.