Department of Biology, Faculty of Science, University of Guilan, Rasht
Abstract
The optomotor response (OMR) is the locomotor behavior of an animal induced by a moving repetitive stimulus pattern. The purpose of the study was optomotor response assessment of visual behavior guppy (Poecilia reticulate). In this study,an apparatus was designed. It was made up of two glass cylinder one placed into another. Around the larger cylinder a transparent hard, removable plastic sheet was fixed bearing different optometrics band line patterns. The transparent sheet could rotate at various speeds at anti-clockwise directions. Experiments were performed with different widths of stripes in black, white (0.5,1, 2, 7,10 cm), with width stripes of 2 cm in red – gray, green – gray, red – green, orange– red and orange– yellow at different velocities of 2, 4, 7, 10, 15 rpm. It was noted 15rpm was the best speed for all band widths where as fish showed finest optical performance at 0.5 cm band width. Optomotor response in fishes in color vision tests has the maximum amount significantly at 10 rpm and has maximum response in orange– yellow strip. Results of 2-way ANOVA showed significant differences in black – white widths and colored stripes at different velocities (P<0.05). Also, the significant interaction was observed between velocity factors, widths and coloured stripes (P<0.05).
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