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Under natural conditions fish can be expected to avoid excessive exposure to potentially damaging radiations from the solar spectrum by moving to deeper water or seeking shade. However in the constricting conditions of aquaculture facilities, fish held at high densities in relatively shallow and often unshaded holding facilities have little option but to suffer exposure to levels of solar radiation considerably greater than those found in nature. Ulraviolet light (UV) occupies a relatively narrow bandwidth from 100 nanometers to 400 nanometers (PARRISH et al., 1978). However, neither vacuum UV nor UV-C reach the earth's surface as they are absorbed by the ozone layer so, for practical purposes, both can be ignored. The proportion of solar UV reaching the earth's surface is very small-only some 3 % of the total solar radiation. For convenience photobiologists divide the UV spectrum into UV-A, the component which sti mulates the pigment containing cells, UV-B which precipitates the sunburn response (as well as stimu lating pigment containing cells to produce a tan ning response like UV-A) and UV-C the antimi crobial component of the UV spectrum.

Recent Observation on the Pathological Effects of Ultraviolet Light on Fish Skin