Abstract

A total of 30 fish were examined during 15 days (in April - March 2013) in three similar tanks with different illumination conditions: control group, total darkness and 40W incandescent light bulb exposure. Every 3 days the fish were examined under the optic microscope (4x) and images were taken for further analysis and interpretations. For the microscopic examination the fish lots were separately placed in a drop of water on a Petri dish. Central nervous system projection was considered to be most relevant due to the higher number of chromatophores in this area. The analysis of the images revealed the total area coverage of the chromatophores in the selected area and also the light influence over chromatophores activity.

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