Within minutes, microscopic creatures called zooplankton begin to hone in on the green light source, very much the way insects are drawn to outdoor lighting. Small fish soon follow, attracted by the zooplankton. Each link in the food chain is followed by the next, over minutes and hours.
The water around the light will actually become foggy with the swirling masses of copepods, small shrimp, and other microorganisms. Large baitfish schools (species dependent on location) will actually learn the location of the light and show up night after night to feed.
This behavior is mimicked by predator fish, who soon learn that easy meals can be found in the shadows surrounding the glow. Within a few weeks, your dock will be a regular feeding station for the local fish populations.
All this unfolds right before your eyes, and from the comfort of your own home. Watch as predatory fish slash their way through schools of baitfish, or suck shrimp from the surface right in front of you.