Why can a blue color underwater light attract sea life?

Why can a blue color underwater light attract sea life?
There are three reasons that can explain why.
1. Water absorbs certain colors of the light spectrum, related to the depth, mostly red and then yellow and green, blue is least absorbed. Deeper than 50m in clear water, there are only blue and green left and fishes in the sea are extremely interested in this kind of blue color. Different particulate materials in the water, that also absorb certain colors, may lead to variations in color, but deeper than 200m there's only blue left.
Scientific research shows that all the fishes have eyes sensitive for blue and green colors. Probably because of the blue and green water these animals live in. Now more and more people get aware that blue color light attracts fishes, shrimp and other sea life at night.

2. Blue color can easily attract sea life, based on the biology of visual receptors in the eyes of water creatures, however blue light is reasonable but not essential. Light at night gets the attention of every creature living under water, the fish as well as the bait, like shrimps, squid or crab. So the best underwater light should have the following advantages to attract sea life:
1. High intensity light.
2. Light emittance in a color similar to the habitat of the fish (blue or green).
3. A portable electrical power supply
4. Submersible light source
5. An LED underwater light should also be taken into consideration, designed with heavy structure, protected against heat dissipation in such low temperature environment. The electrical equipment completely sealed to resist water and vibration. By using an underwater LED light one can avoid the reflection of a great quantity of light on the water's surface.

3. Now you may realize why people use blue light attached to a structure above the water or under water, to attract both fish and animals of their food chain for more fishes.