Aquatic environment as a place to live or live media aquatic organisms is one of the most important aspects to consider in doing aquaculture. This is because the quality of the waters of a container cultivation largely determines the life of aquatic organisms cultivated, both from the aspect of water resources which are used as parameters of physics, chemistry and biology, it is also necessary to know and understand the aspects required in the management of water quality.
Physical parameters are parameters that can be observed as a result of physical changes in water such as light, temperature, brightness, turbidity, color, suspended solids and dissolved solids to water salinity. While chemical parameters of waters are waters measured parameter due to a chemical reaction in water, such as the exchange of ions dissolved in water. The observed biological parameter waters are aquatic organisms that live together in waters crops are plants and animals with a form of micro and macro.
Physical properties of water is a factor of separation between the aquatic environment with air environment. Besides physical factors also affect the lives of many organisms in the water. The existence of huge differences of each physical factor in the aquatic environment with air environment, results in a different effect on plants and animals in each of these environments. In addition, water also serves to maintain the osmotic pressure, as a solvent and a good conductor of electricity.
Color can inhibit the penetration of light into the water. Colored sea water by natural processes, both derived from the biological and non-biological. The product of a biological process can be humus, peat and others, while the products of non-biological processes can form chemical compounds containing elements Fe, Ni, Co, Mn, and others. In addition, sea water discoloration can be caused by human activities that produce colored waste. Sea water with a certain color levels can reduce photosynthesis and can disrupt aquatic biota, especially phytoplankton and some types of benthos.
Water color on a body of water that we see is a:
a) File a light that is not absorbed and out the back of the waters.
b) The color caused by materials that hovered in the form of organisms and inanimate objects. Colorful water such as: blue, green, yellow green and brown color.
Figure 1. A colorful public waters (a) Coastal Raja Ampat, Indonesia (b) Lake Hiller, Australia, (c) Lake Flores, NTT Indonesia, (d) La Jollla Beach, San Diego, (e) saltwater in San Francisco Bay and (f) hot springs The grand prismatic spring in the United States.