Nutrients promote and support the growth of algae and Cyanobacteria. The eutrophication (nutrient enrichment) of waterways is considered as a major factor. The main nutrients contributing to eutrophication are phosphorus and nitrogen. This phenomenon encourages the growth of algae.

Light is the most limiting factor for algal growth, followed by nitrogen and phosphorus limitations. Algal productivity is often correlated to levels of nitrogen (N) and phosphorus (P) (See N:P. ratio, above), but other nutrients are required including carbon, silica, and other micronutrients.

Algae can be unicellular or as large as a tree like the giant sea kelp. Algae are typically photosynthetic, meaning they need carbon dioxide and sunlight to grow – just like plants.

Because algae use carbon dioxide and release oxygen as a product of the light reactions, these plants play an important role in maintaining the proper concentrations of carbon dioxide and oxygen in the environment, via the carbon cycle and oxygen cycle.

Pollution, Water Several elements, but particularly nitrogen and phosphorus, are essential and play a major role in the primary productivity of a water body. These nutrients are a main limiting factor for algal growth in many water bodies.

Hair algae can grow perfectly well in only blue light if water conditions are favorable for it.

Sunlight

Algae uses red light to conduct photosynthesis. This scientific fact can be used to limit algae growth. Using only a little red light will slow algae growth.

For the most part, red lights are not bad for aquarium fish. The light will encourage pigmentation in red plants as well. Unfortunately, you can only use red lights in moderation because algae use the red frequency to conduct photosynthesis, and only using a little of this spectrum will slow the algae growth.

The first thing that attracts them is the sound of the boat and its engines. The propellors and the noise of the boat moving through the water create a lot of sound waves and vibrations that run through the water. In fact, some boats are known as better fish raisers than others based on the sounds they emit.

Any light under the water, no matter what the color, will attract fish. When lights are placed under the water, they reflect off particles in the water. These tiny little particles enhance a natural food source for bait fish. These bait fish are then attracted to the light.

Fish see full spectrum sunlight. Deep water filters out red light so a lot of fish in deep water are actually red since it renders them effectively invisible (this is why a lot of squind and stuff are pink/red).