I was involved in some work with an undergraduate from Simon Fraser University that looked at the influence of continuous illumination at night, the distribution and abundance of juvenile salmon, as well as all other critters in the water. Not surprisingly, given mountains of scientific work throughout the years, light attracts a lot of marine organisms. This is an area that is ripe for further exploration. One doesn't want to go out willy-nilly and say that it's having an impact or it isn't, but it's an area that certainly needs to be investigated.
On November 15th, 2010. See this statement in context.