The brook trout, Salvelinus fontinalis, is a species of fish in the salmon family of order Salmoniformes. In many parts of its range, it is known as the speckled trout or squaretail. A potamodromous population in Lake Superior are known as coaster trout or, simply, as coasters. Though commonly called a trout, the brook trout is actually a char, along with lake trout, bull trout, Dolly Varden and the Arctic char.
The brook trout is native to small streams, creeks, lakes, and spring ponds. Individuals normally spend their entire life in fresh water, but some - colloquially called "salters" or "sea run" - may spend up to three months at sea in the spring, not straying more than a few kilometres from the river mouth. The fish return upstream to spawn in the late summer or autumn. The female constructs a depression in a location in the stream bed, sometimes referred to as a "redd", where groundwater percolates upward through the gravel. One or more males approaches the female, fertilizing the eggs as the female expresses them. The eggs are slightly denser than water. The female then buries the eggs in a small gravel mound. The eggs hatch in 95 to 100 days.
Source: en.wikipedia.org/wiki/Brook_trout – 18.09.2011
Not only the body shows manifold hues and gentle designs, but even the half-transparent fins possess gentle colour gradients.