If you don't see the fish or hear the fish ...
... there are no fish.
That's always been my mantra on the vineyard, especially when fishing at night.
When fishing at night, your main sense is your hearing. Even in a strong current, it's very discernable when fish are present and hitting bait on the surface. The backup is your vision, but it's hard to see the fish unless there's a fraction of a moon.
Bottom line: when fishing at night, stop and put on your listening ears!