Regardless of the kind, every wave has an amplitude. Amplitude is the maximum displacement of points on a wave, which you can think of as the degree or intensity of change. This maximum displacement is measured from the equilibrium position.The picture below shows a diagram of a sine wave.mplitude is an important parameter of waves and is the maximum displacement of points on a wave. Stated another way, amplitude is the vertical distance between a peak or a valley and the equilibrium point. Frequency is the number of wave cycles passing a point per unit time.
Darkfield Digital Image Gallery Dogfish Shark Placoid Scales Dogfish sharks are small sharks belonging to one of three families: the dogfish shark family, Squalidae; the requiem shark family, Carcharhinidae; and the cat shark family, Scyliorhinidae.he green dogfish, along with several other members of the dogfish shark family, is luminescent. Scales are small plates that form part of the skin of certain animals. They provide protection from the environment and from predators. Sharks have placoid scales, bony, spiny projections with an enamel-like covering.
Such scales have a definite size and do not grow along with the animal. Instead when the animal's growth opens up a large enough space between two or more denticles a new one grows to fill the space. The scales/denticles of cartilaginous fish are discrete, they do not overlap as do the scales of bony fishes.In the images below show that part of the scale which is embedded in the skin of the fish as coloured orange, (however in reality it is not coloured like this) and the part we see as coloured grey.ther species, like the Common Eel appear to have no scales but they really have microscopic scales deeply embedded in their dermis. Even in those fish that have scales they do not always cover the whole body. The size, and distribution of scales over a fish's body often, but not always, reflect the way it lives.