Possible Clues:

• It takes its toll
• Go with swimmer to find toll road
• Move fish around on toll road
• Toll-gate
• American way to spoil fish
• Go and fish in way that costs money
• Old gates across a road to prevent passage until a toll was paid
• Go for a spin with long swimmer - it'll cost, but it's worth the journey!
• Go and fish where one pays one's way
• Old toll-gate, or new road with toll stations